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Finding the Fourth Proportional to 87.39, 130.83 and 74.47

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Solution

The fourth proportional to 87.39, 130.83 and 74.47 is: 111.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.39 : 130.83 = 74.47 : x
  2. Step 2: Convert to fraction form
    87.39/130.83 = 74.47/x
  3. Step 3: Cross multiply
    87.39x = 130.83 × 74.47
  4. Step 4: Simplify right side
    87.39x = 9,742.91
  5. Step 5: Solve for x
    x = 9,742.91/87.39
  6. Step 6: Final answer
    x = 111.49

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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.