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Finding the Fourth Proportional to 39.49, 59.24 and 13.81

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Solution

The fourth proportional to 39.49, 59.24 and 13.81 is: 20.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.49 : 59.24 = 13.81 : x
  2. Step 2: Convert to fraction form
    39.49/59.24 = 13.81/x
  3. Step 3: Cross multiply
    39.49x = 59.24 × 13.81
  4. Step 4: Simplify right side
    39.49x = 818.10
  5. Step 5: Solve for x
    x = 818.10/39.49
  6. Step 6: Final answer
    x = 20.72

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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.