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Finding the Fourth Proportional to 79.41, 118.92 and 38.70

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Solution

The fourth proportional to 79.41, 118.92 and 38.70 is: 57.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.41 : 118.92 = 38.70 : x
  2. Step 2: Convert to fraction form
    79.41/118.92 = 38.70/x
  3. Step 3: Cross multiply
    79.41x = 118.92 × 38.70
  4. Step 4: Simplify right side
    79.41x = 4,601.61
  5. Step 5: Solve for x
    x = 4,601.61/79.41
  6. Step 6: Final answer
    x = 57.95

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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.