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Finding the Fourth Proportional to 87.50, 130.48 and 81.23

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Solution

The fourth proportional to 87.50, 130.48 and 81.23 is: 121.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.50 : 130.48 = 81.23 : x
  2. Step 2: Convert to fraction form
    87.50/130.48 = 81.23/x
  3. Step 3: Cross multiply
    87.50x = 130.48 × 81.23
  4. Step 4: Simplify right side
    87.50x = 10,599.23
  5. Step 5: Solve for x
    x = 10,599.23/87.50
  6. Step 6: Final answer
    x = 121.13

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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.