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Finding the Fourth Proportional to 67.48, 101.25 and 21.85

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Solution

The fourth proportional to 67.48, 101.25 and 21.85 is: 32.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.48 : 101.25 = 21.85 : x
  2. Step 2: Convert to fraction form
    67.48/101.25 = 21.85/x
  3. Step 3: Cross multiply
    67.48x = 101.25 × 21.85
  4. Step 4: Simplify right side
    67.48x = 2,212.31
  5. Step 5: Solve for x
    x = 2,212.31/67.48
  6. Step 6: Final answer
    x = 32.78

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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.