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Finding the Fourth Proportional to 67.38, 92.90 and 42.78

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Solution

The fourth proportional to 67.38, 92.90 and 42.78 is: 58.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.38 : 92.90 = 42.78 : x
  2. Step 2: Convert to fraction form
    67.38/92.90 = 42.78/x
  3. Step 3: Cross multiply
    67.38x = 92.90 × 42.78
  4. Step 4: Simplify right side
    67.38x = 3,974.26
  5. Step 5: Solve for x
    x = 3,974.26/67.38
  6. Step 6: Final answer
    x = 58.98

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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.