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Finding the Fourth Proportional to 42.22, 63.33 and 13.72

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Solution

The fourth proportional to 42.22, 63.33 and 13.72 is: 20.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.22 : 63.33 = 13.72 : x
  2. Step 2: Convert to fraction form
    42.22/63.33 = 13.72/x
  3. Step 3: Cross multiply
    42.22x = 63.33 × 13.72
  4. Step 4: Simplify right side
    42.22x = 868.85
  5. Step 5: Solve for x
    x = 868.85/42.22
  6. Step 6: Final answer
    x = 20.58

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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.