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Finding the Fourth Proportional to 87.41, 131.60 and 72.43

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Solution

The fourth proportional to 87.41, 131.60 and 72.43 is: 109.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.41 : 131.60 = 72.43 : x
  2. Step 2: Convert to fraction form
    87.41/131.60 = 72.43/x
  3. Step 3: Cross multiply
    87.41x = 131.60 × 72.43
  4. Step 4: Simplify right side
    87.41x = 9,531.46
  5. Step 5: Solve for x
    x = 9,531.46/87.41
  6. Step 6: Final answer
    x = 109.04

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.