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Finding the Fourth Proportional to 17.90, 24.72 and 15.61

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Solution

The fourth proportional to 17.90, 24.72 and 15.61 is: 21.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.90 : 24.72 = 15.61 : x
  2. Step 2: Convert to fraction form
    17.90/24.72 = 15.61/x
  3. Step 3: Cross multiply
    17.90x = 24.72 × 15.61
  4. Step 4: Simplify right side
    17.90x = 385.88
  5. Step 5: Solve for x
    x = 385.88/17.90
  6. Step 6: Final answer
    x = 21.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.