Finding the Fourth Proportional to 87.78, 132.38 and 84.99
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Solution
The fourth proportional to 87.78, 132.38 and 84.99 is: 128.17
Step by Step Solution
- Step 1: Write the proportion equation
87.78 : 132.38 = 84.99 : x - Step 2: Convert to fraction form
87.78/132.38 = 84.99/x - Step 3: Cross multiply
87.78x = 132.38 × 84.99 - Step 4: Simplify right side
87.78x = 11,250.55 - Step 5: Solve for x
x = 11,250.55/87.78 - Step 6: Final answer
x = 128.17
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Why These Related Problems?
These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.