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Finding the Fourth Proportional to 39.97, 55.13 and 30.75

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Solution

The fourth proportional to 39.97, 55.13 and 30.75 is: 42.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.97 : 55.13 = 30.75 : x
  2. Step 2: Convert to fraction form
    39.97/55.13 = 30.75/x
  3. Step 3: Cross multiply
    39.97x = 55.13 × 30.75
  4. Step 4: Simplify right side
    39.97x = 1,695.53
  5. Step 5: Solve for x
    x = 1,695.53/39.97
  6. Step 6: Final answer
    x = 42.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.