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Finding the Fourth Proportional to 67.30, 100.42 and 66.92

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Solution

The fourth proportional to 67.30, 100.42 and 66.92 is: 99.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.30 : 100.42 = 66.92 : x
  2. Step 2: Convert to fraction form
    67.30/100.42 = 66.92/x
  3. Step 3: Cross multiply
    67.30x = 100.42 × 66.92
  4. Step 4: Simplify right side
    67.30x = 6,720.11
  5. Step 5: Solve for x
    x = 6,720.11/67.30
  6. Step 6: Final answer
    x = 99.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.