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Finding the Fourth Proportional to 39.91, 59.86 and 12.48

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Solution

The fourth proportional to 39.91, 59.86 and 12.48 is: 18.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.91 : 59.86 = 12.48 : x
  2. Step 2: Convert to fraction form
    39.91/59.86 = 12.48/x
  3. Step 3: Cross multiply
    39.91x = 59.86 × 12.48
  4. Step 4: Simplify right side
    39.91x = 747.05
  5. Step 5: Solve for x
    x = 747.05/39.91
  6. Step 6: Final answer
    x = 18.72

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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.