Finding the Fourth Proportional to 72.10, 99.69 and 62.99
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Solution
The fourth proportional to 72.10, 99.69 and 62.99 is: 87.09
Step by Step Solution
- Step 1: Write the proportion equation
72.10 : 99.69 = 62.99 : x - Step 2: Convert to fraction form
72.10/99.69 = 62.99/x - Step 3: Cross multiply
72.10x = 99.69 × 62.99 - Step 4: Simplify right side
72.10x = 6,279.47 - Step 5: Solve for x
x = 6,279.47/72.10 - Step 6: Final answer
x = 87.09
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.