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Finding the Fourth Proportional to 87.53, 130.60 and 84.38

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Solution

The fourth proportional to 87.53, 130.60 and 84.38 is: 125.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.53 : 130.60 = 84.38 : x
  2. Step 2: Convert to fraction form
    87.53/130.60 = 84.38/x
  3. Step 3: Cross multiply
    87.53x = 130.60 × 84.38
  4. Step 4: Simplify right side
    87.53x = 11,020.11
  5. Step 5: Solve for x
    x = 11,020.11/87.53
  6. Step 6: Final answer
    x = 125.89

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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.