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Finding the Fourth Proportional to 39.53, 59.31 and 13.86

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Solution

The fourth proportional to 39.53, 59.31 and 13.86 is: 20.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.53 : 59.31 = 13.86 : x
  2. Step 2: Convert to fraction form
    39.53/59.31 = 13.86/x
  3. Step 3: Cross multiply
    39.53x = 59.31 × 13.86
  4. Step 4: Simplify right side
    39.53x = 822.04
  5. Step 5: Solve for x
    x = 822.04/39.53
  6. Step 6: Final answer
    x = 20.79

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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.