Finding the Fourth Proportional to 86.80, 129.44 and 71.44
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Solution
The fourth proportional to 86.80, 129.44 and 71.44 is: 106.53
Step by Step Solution
- Step 1: Write the proportion equation
86.80 : 129.44 = 71.44 : x - Step 2: Convert to fraction form
86.80/129.44 = 71.44/x - Step 3: Cross multiply
86.80x = 129.44 × 71.44 - Step 4: Simplify right side
86.80x = 9,247.19 - Step 5: Solve for x
x = 9,247.19/86.80 - Step 6: Final answer
x = 106.53
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.