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Finding the Fourth Proportional to 67.44, 101.16 and 21.79

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Solution

The fourth proportional to 67.44, 101.16 and 21.79 is: 32.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.44 : 101.16 = 21.79 : x
  2. Step 2: Convert to fraction form
    67.44/101.16 = 21.79/x
  3. Step 3: Cross multiply
    67.44x = 101.16 × 21.79
  4. Step 4: Simplify right side
    67.44x = 2,204.05
  5. Step 5: Solve for x
    x = 2,204.05/67.44
  6. Step 6: Final answer
    x = 32.68

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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.