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Finding the Fourth Proportional to 15.97, 22.18 and 15.75

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Solution

The fourth proportional to 15.97, 22.18 and 15.75 is: 21.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.97 : 22.18 = 15.75 : x
  2. Step 2: Convert to fraction form
    15.97/22.18 = 15.75/x
  3. Step 3: Cross multiply
    15.97x = 22.18 × 15.75
  4. Step 4: Simplify right side
    15.97x = 349.34
  5. Step 5: Solve for x
    x = 349.34/15.97
  6. Step 6: Final answer
    x = 21.88

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.