Finding the Fourth Proportional to 129.11, 177.96 and 87.65
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Solution
The fourth proportional to 129.11, 177.96 and 87.65 is: 120.81
Step by Step Solution
- Step 1: Write the proportion equation
129.11 : 177.96 = 87.65 : x - Step 2: Convert to fraction form
129.11/177.96 = 87.65/x - Step 3: Cross multiply
129.11x = 177.96 × 87.65 - Step 4: Simplify right side
129.11x = 15,597.30 - Step 5: Solve for x
x = 15,597.30/129.11 - Step 6: Final answer
x = 120.81
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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.