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Finding the Fourth Proportional to 118.31, 177.51 and 49.85

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Solution

The fourth proportional to 118.31, 177.51 and 49.85 is: 74.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.31 : 177.51 = 49.85 : x
  2. Step 2: Convert to fraction form
    118.31/177.51 = 49.85/x
  3. Step 3: Cross multiply
    118.31x = 177.51 × 49.85
  4. Step 4: Simplify right side
    118.31x = 8,847.99
  5. Step 5: Solve for x
    x = 8,847.99/118.31
  6. Step 6: Final answer
    x = 74.79

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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.