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Finding the Fourth Proportional to 118.39, 177.59 and 49.90

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Solution

The fourth proportional to 118.39, 177.59 and 49.90 is: 74.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.39 : 177.59 = 49.90 : x
  2. Step 2: Convert to fraction form
    118.39/177.59 = 49.90/x
  3. Step 3: Cross multiply
    118.39x = 177.59 × 49.90
  4. Step 4: Simplify right side
    118.39x = 8,861.74
  5. Step 5: Solve for x
    x = 8,861.74/118.39
  6. Step 6: Final answer
    x = 74.85

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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.