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Finding the Fourth Proportional to 57.15, 85.61 and 31.43

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Solution

The fourth proportional to 57.15, 85.61 and 31.43 is: 47.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.15 : 85.61 = 31.43 : x
  2. Step 2: Convert to fraction form
    57.15/85.61 = 31.43/x
  3. Step 3: Cross multiply
    57.15x = 85.61 × 31.43
  4. Step 4: Simplify right side
    57.15x = 2,691.01
  5. Step 5: Solve for x
    x = 2,691.01/57.15
  6. Step 6: Final answer
    x = 47.09

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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.