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Finding the Fourth Proportional to 118.62, 177.20 and 112.70

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Solution

The fourth proportional to 118.62, 177.20 and 112.70 is: 168.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.62 : 177.20 = 112.70 : x
  2. Step 2: Convert to fraction form
    118.62/177.20 = 112.70/x
  3. Step 3: Cross multiply
    118.62x = 177.20 × 112.70
  4. Step 4: Simplify right side
    118.62x = 19,969.88
  5. Step 5: Solve for x
    x = 19,969.88/118.62
  6. Step 6: Final answer
    x = 168.35

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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.