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Finding the Fourth Proportional to 87.93, 131.90 and 47.43

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Solution

The fourth proportional to 87.93, 131.90 and 47.43 is: 71.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.93 : 131.90 = 47.43 : x
  2. Step 2: Convert to fraction form
    87.93/131.90 = 47.43/x
  3. Step 3: Cross multiply
    87.93x = 131.90 × 47.43
  4. Step 4: Simplify right side
    87.93x = 6,256.14
  5. Step 5: Solve for x
    x = 6,256.14/87.93
  6. Step 6: Final answer
    x = 71.15

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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.