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Finding the Fourth Proportional to 39.61, 59.41 and 13.91

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Solution

The fourth proportional to 39.61, 59.41 and 13.91 is: 20.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.61 : 59.41 = 13.91 : x
  2. Step 2: Convert to fraction form
    39.61/59.41 = 13.91/x
  3. Step 3: Cross multiply
    39.61x = 59.41 × 13.91
  4. Step 4: Simplify right side
    39.61x = 826.51
  5. Step 5: Solve for x
    x = 826.51/39.61
  6. Step 6: Final answer
    x = 20.87

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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.