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Finding the Fourth Proportional to 57.87, 87.17 and 47.31

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Solution

The fourth proportional to 57.87, 87.17 and 47.31 is: 71.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.87 : 87.17 = 47.31 : x
  2. Step 2: Convert to fraction form
    57.87/87.17 = 47.31/x
  3. Step 3: Cross multiply
    57.87x = 87.17 × 47.31
  4. Step 4: Simplify right side
    57.87x = 4,124.13
  5. Step 5: Solve for x
    x = 4,124.13/57.87
  6. Step 6: Final answer
    x = 71.27

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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.