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Finding the Fourth Proportional to 87.35, 130.74 and 66.95

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Solution

The fourth proportional to 87.35, 130.74 and 66.95 is: 100.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.35 : 130.74 = 66.95 : x
  2. Step 2: Convert to fraction form
    87.35/130.74 = 66.95/x
  3. Step 3: Cross multiply
    87.35x = 130.74 × 66.95
  4. Step 4: Simplify right side
    87.35x = 8,753.04
  5. Step 5: Solve for x
    x = 8,753.04/87.35
  6. Step 6: Final answer
    x = 100.21

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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.