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Finding the Fourth Proportional to 87.24, 130.26 and 81.48

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Solution

The fourth proportional to 87.24, 130.26 and 81.48 is: 121.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.24 : 130.26 = 81.48 : x
  2. Step 2: Convert to fraction form
    87.24/130.26 = 81.48/x
  3. Step 3: Cross multiply
    87.24x = 130.26 × 81.48
  4. Step 4: Simplify right side
    87.24x = 10,613.58
  5. Step 5: Solve for x
    x = 10,613.58/87.24
  6. Step 6: Final answer
    x = 121.66

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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.