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Finding the Fourth Proportional to 100.92, 151.32 and 36.78

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Solution

The fourth proportional to 100.92, 151.32 and 36.78 is: 55.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.92 : 151.32 = 36.78 : x
  2. Step 2: Convert to fraction form
    100.92/151.32 = 36.78/x
  3. Step 3: Cross multiply
    100.92x = 151.32 × 36.78
  4. Step 4: Simplify right side
    100.92x = 5,565.55
  5. Step 5: Solve for x
    x = 5,565.55/100.92
  6. Step 6: Final answer
    x = 55.15

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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.