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Under Ligntning Builder CSS

/*Inline Radio Buttons*/
.radio-combo-inline .slds-form-element__control .slds-radio
{
    display: inline-block !important;
}

Add Above And Final use in HTML be looklike

<lightning-radio-group name="radioGroup"
                       label="Sort By"
                       options={sortBySelectionValues}
                       value={value}
                       class="radio-combo-inline"
                       type="radio"></lightning-radio-group>

Under Ligntning Builder CSS

/*Inline Radio Buttons*/
.radio-combo-inline .slds-form-element__control .slds-radio
{
    display: inline-block !important;
}

Add Above And Final use in HTML be looklike

<lightning-radio-group name="radioGroup"
                       label="Sort By"
                       options={sortBySelectionValues}
                       value={value}
                       class="radio-combo-inline"
                       type="radio"></lightning-radio-group>

Under Ligntning Builder CSS  

 /*Inline Radio Buttons*/
.radio-combo-inline .slds-form-element__control .slds-radio
{
    display: inline-block !important;
}

Add Above And Final use in HTML be looklike 
<lightning-radio-group name="radioGroup"
                                        label="Sort By"
                                        options={sortBySelectionValues}
                                        value={value}
                                        class="radio-combo-inline"
                                        type="radio"></lightning-radio-group>

Under Ligntning Builder CSS 

/*Inline Radio Buttons*/
.radio-combo-inline .slds-form-element__control .slds-radio
{
    display: inline-block !important;
}

Add Above And Final use in HTML be looklike

<lightning-radio-group name="radioGroup"
                       label="Sort By"
                       options={sortBySelectionValues}
                       value={value}
                       class="radio-combo-inline"
                       type="radio"></lightning-radio-group>

Under Ligntning Builder CSS

 /*Inline Radio Buttons*/
.radio-combo-inline .slds-form-element__control .slds-radio
{
    display: inline-block !important;
}

And Final use in HTML be looklike 
<lightning-radio-group name="radioGroup"
                                        label="Sort By"
                                        options={sortBySelectionValues}
                                        value={value}
                                        class="radio-combo-inline"
                                        type="radio"></lightning-radio-group>

Under Ligntning Builder CSS

 /*Inline Radio Buttons*/
.radio-combo-inline .slds-form-element__control .slds-radio
{
    display: inline-block !important;
}

Add Above And Final use in HTML be looklike 
<lightning-radio-group name="radioGroup"
                                        label="Sort By"
                                        options={sortBySelectionValues}
                                        value={value}
                                        class="radio-combo-inline"
                                        type="radio"></lightning-radio-group>