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Finding the Fourth Proportional to 87.74, 131.71 and 47.15

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Solution

The fourth proportional to 87.74, 131.71 and 47.15 is: 70.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.74 : 131.71 = 47.15 : x
  2. Step 2: Convert to fraction form
    87.74/131.71 = 47.15/x
  3. Step 3: Cross multiply
    87.74x = 131.71 × 47.15
  4. Step 4: Simplify right side
    87.74x = 6,210.13
  5. Step 5: Solve for x
    x = 6,210.13/87.74
  6. Step 6: Final answer
    x = 70.78

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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.