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Finding the Fourth Proportional to 118.60, 177.59 and 84.31

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Solution

The fourth proportional to 118.60, 177.59 and 84.31 is: 126.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.60 : 177.59 = 84.31 : x
  2. Step 2: Convert to fraction form
    118.60/177.59 = 84.31/x
  3. Step 3: Cross multiply
    118.60x = 177.59 × 84.31
  4. Step 4: Simplify right side
    118.60x = 14,972.38
  5. Step 5: Solve for x
    x = 14,972.38/118.60
  6. Step 6: Final answer
    x = 126.25

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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.