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Finding the Fourth Proportional to 90.92, 136.82 and 74.79

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Solution

The fourth proportional to 90.92, 136.82 and 74.79 is: 112.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.92 : 136.82 = 74.79 : x
  2. Step 2: Convert to fraction form
    90.92/136.82 = 74.79/x
  3. Step 3: Cross multiply
    90.92x = 136.82 × 74.79
  4. Step 4: Simplify right side
    90.92x = 10,232.95
  5. Step 5: Solve for x
    x = 10,232.95/90.92
  6. Step 6: Final answer
    x = 112.55

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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.