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Finding the Fourth Proportional to 57.24, 85.74 and 42

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Solution

The fourth proportional to 57.24, 85.74 and 42 is: 62.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.24 : 85.74 = 42 : x
  2. Step 2: Convert to fraction form
    57.24/85.74 = 42/x
  3. Step 3: Cross multiply
    57.24x = 85.74 × 42
  4. Step 4: Simplify right side
    57.24x = 3,601.08
  5. Step 5: Solve for x
    x = 3,601.08/57.24
  6. Step 6: Final answer
    x = 62.91

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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.