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Finding the Fourth Proportional to 15.90, 23.82 and 13.87

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Solution

The fourth proportional to 15.90, 23.82 and 13.87 is: 20.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.90 : 23.82 = 13.87 : x
  2. Step 2: Convert to fraction form
    15.90/23.82 = 13.87/x
  3. Step 3: Cross multiply
    15.90x = 23.82 × 13.87
  4. Step 4: Simplify right side
    15.90x = 330.38
  5. Step 5: Solve for x
    x = 330.38/15.90
  6. Step 6: Final answer
    x = 20.78

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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.