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Finding the Fourth Proportional to 67.68, 93.38 and 42.79

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Solution

The fourth proportional to 67.68, 93.38 and 42.79 is: 59.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.68 : 93.38 = 42.79 : x
  2. Step 2: Convert to fraction form
    67.68/93.38 = 42.79/x
  3. Step 3: Cross multiply
    67.68x = 93.38 × 42.79
  4. Step 4: Simplify right side
    67.68x = 3,995.73
  5. Step 5: Solve for x
    x = 3,995.73/67.68
  6. Step 6: Final answer
    x = 59.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.