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Finding the Fourth Proportional to 42.24, 57.92 and 39.81

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Solution

The fourth proportional to 42.24, 57.92 and 39.81 is: 54.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.24 : 57.92 = 39.81 : x
  2. Step 2: Convert to fraction form
    42.24/57.92 = 39.81/x
  3. Step 3: Cross multiply
    42.24x = 57.92 × 39.81
  4. Step 4: Simplify right side
    42.24x = 2,305.60
  5. Step 5: Solve for x
    x = 2,305.60/42.24
  6. Step 6: Final answer
    x = 54.58

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.