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Finding the Fourth Proportional to 87.29, 130.92 and 74.99

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Solution

The fourth proportional to 87.29, 130.92 and 74.99 is: 112.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.29 : 130.92 = 74.99 : x
  2. Step 2: Convert to fraction form
    87.29/130.92 = 74.99/x
  3. Step 3: Cross multiply
    87.29x = 130.92 × 74.99
  4. Step 4: Simplify right side
    87.29x = 9,817.04
  5. Step 5: Solve for x
    x = 9,817.04/87.29
  6. Step 6: Final answer
    x = 112.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.