Ratio and Proportion - Rule of Three Examples

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Home > Algebra > Ratio and Proportion > Rule of Three example

Ratio and Proportion - 15. Rule of Three example ( Enter your problem )

( Enter your problem )

1. Examples

1. Direct Rule of Three, `3 / 5 = 6 / x`

Solution:
`A/B=C/D`

`:.3/5=6/x`

`:.x=30/3`

`:.x=10`

2. Direct Rule of Three, `2 / 5 = 6 / x`

Solution:
`A/B=C/D`

`:.2/5=6/x`

`:.x=30/2`

`:.x=15`

3. Inverse Rule of Three, `4 xx 9 = 6 xx x`

Solution:
`AxxB=CxxD`

`:.4 xx 9=6 xx x`

`:.x=36/6`

`:.x=6`

4. Inverse Rule of Three, `3 xx 12 = 4 xx x`

Solution:
`AxxB=CxxD`

`:.3 xx 12=4 xx x`

`:.x=36/4`

`:.x=9`

This material is intended as a summary. Use your textbook for detail explanation.
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