Finding the Fourth Proportional to 74.61, 102.87 and 63.68
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Solution
The fourth proportional to 74.61, 102.87 and 63.68 is: 87.79
Step by Step Solution
- Step 1: Write the proportion equation
74.61 : 102.87 = 63.68 : x - Step 2: Convert to fraction form
74.61/102.87 = 63.68/x - Step 3: Cross multiply
74.61x = 102.87 × 63.68 - Step 4: Simplify right side
74.61x = 6,550.25 - Step 5: Solve for x
x = 6,550.25/74.61 - Step 6: Final answer
x = 87.79
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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.