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Finding the Fourth Proportional to 79.11, 118.61 and 38.55

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Solution

The fourth proportional to 79.11, 118.61 and 38.55 is: 57.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.11 : 118.61 = 38.55 : x
  2. Step 2: Convert to fraction form
    79.11/118.61 = 38.55/x
  3. Step 3: Cross multiply
    79.11x = 118.61 × 38.55
  4. Step 4: Simplify right side
    79.11x = 4,572.42
  5. Step 5: Solve for x
    x = 4,572.42/79.11
  6. Step 6: Final answer
    x = 57.80

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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.