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Finding the Fourth Proportional to 13.61, 20.39 and 10.59

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Solution

The fourth proportional to 13.61, 20.39 and 10.59 is: 15.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.61 : 20.39 = 10.59 : x
  2. Step 2: Convert to fraction form
    13.61/20.39 = 10.59/x
  3. Step 3: Cross multiply
    13.61x = 20.39 × 10.59
  4. Step 4: Simplify right side
    13.61x = 215.93
  5. Step 5: Solve for x
    x = 215.93/13.61
  6. Step 6: Final answer
    x = 15.87

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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.