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Finding the Fourth Proportional to 118.49, 177.90 and 84.47

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Solution

The fourth proportional to 118.49, 177.90 and 84.47 is: 126.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.49 : 177.90 = 84.47 : x
  2. Step 2: Convert to fraction form
    118.49/177.90 = 84.47/x
  3. Step 3: Cross multiply
    118.49x = 177.90 × 84.47
  4. Step 4: Simplify right side
    118.49x = 15,027.21
  5. Step 5: Solve for x
    x = 15,027.21/118.49
  6. Step 6: Final answer
    x = 126.82

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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.