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Finding the Fourth Proportional to 118.31, 177.49 and 49.91

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Solution

The fourth proportional to 118.31, 177.49 and 49.91 is: 74.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.31 : 177.49 = 49.91 : x
  2. Step 2: Convert to fraction form
    118.31/177.49 = 49.91/x
  3. Step 3: Cross multiply
    118.31x = 177.49 × 49.91
  4. Step 4: Simplify right side
    118.31x = 8,858.84
  5. Step 5: Solve for x
    x = 8,858.84/118.31
  6. Step 6: Final answer
    x = 74.88

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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.