Finding the Third Proportional to 69 and 72.50
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Solution
The third proportional to 69 and 72.50 is: 76.18
Step by Step Solution
- Step 1: Write the proportion equation
69 : 72.50 = 72.50 : x - Step 2: Convert to fraction form
69/72.50 = 72.50/x - Step 3: Cross multiply
69x = 72.50 × 72.50 - Step 4: Simplify right side
69x = 5,256.25 - Step 5: Solve for x
x = 5,256.25/69 - Step 6: Final answer
x = 76.18
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.