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Finding the Fourth Proportional to 57.97, 86.75 and 42.72

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Solution

The fourth proportional to 57.97, 86.75 and 42.72 is: 63.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.97 : 86.75 = 42.72 : x
  2. Step 2: Convert to fraction form
    57.97/86.75 = 42.72/x
  3. Step 3: Cross multiply
    57.97x = 86.75 × 42.72
  4. Step 4: Simplify right side
    57.97x = 3,705.53
  5. Step 5: Solve for x
    x = 3,705.53/57.97
  6. Step 6: Final answer
    x = 63.92

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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.