Home / 231,687.05-319,691.07-129,716.78

Finding the Fourth Proportional to 231,687.05, 319,691.07 and 129,716.78

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Solution

The fourth proportional to 231,687.05, 319,691.07 and 129,716.78 is: 178,988.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,687.05 : 319,691.07 = 129,716.78 : x
  2. Step 2: Convert to fraction form
    231,687.05/319,691.07 = 129,716.78/x
  3. Step 3: Cross multiply
    231,687.05x = 319,691.07 × 129,716.78
  4. Step 4: Simplify right side
    231,687.05x = 41,469,294,596.70
  5. Step 5: Solve for x
    x = 41,469,294,596.70/231,687.05
  6. Step 6: Final answer
    x = 178,988.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.