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Finding the Fourth Proportional to 118.80, 177.56 and 91.46

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Solution

The fourth proportional to 118.80, 177.56 and 91.46 is: 136.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.80 : 177.56 = 91.46 : x
  2. Step 2: Convert to fraction form
    118.80/177.56 = 91.46/x
  3. Step 3: Cross multiply
    118.80x = 177.56 × 91.46
  4. Step 4: Simplify right side
    118.80x = 16,239.97
  5. Step 5: Solve for x
    x = 16,239.97/118.80
  6. Step 6: Final answer
    x = 136.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.