Finding the Third Proportional to 7 and 15.31
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Solution
The third proportional to 7 and 15.31 is: 33.50
Step by Step Solution
- Step 1: Write the proportion equation
7 : 15.31 = 15.31 : x - Step 2: Convert to fraction form
7/15.31 = 15.31/x - Step 3: Cross multiply
7x = 15.31 × 15.31 - Step 4: Simplify right side
7x = 234.47 - Step 5: Solve for x
x = 234.47/7 - Step 6: Final answer
x = 33.50
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Double scale
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Similar ratio
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.