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Finding the Fourth Proportional to 231,717.31, 319,743.46 and 129,728.59

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Solution

The fourth proportional to 231,717.31, 319,743.46 and 129,728.59 is: 179,010.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,717.31 : 319,743.46 = 129,728.59 : x
  2. Step 2: Convert to fraction form
    231,717.31/319,743.46 = 129,728.59/x
  3. Step 3: Cross multiply
    231,717.31x = 319,743.46 × 129,728.59
  4. Step 4: Simplify right side
    231,717.31x = 41,479,867,903.20
  5. Step 5: Solve for x
    x = 41,479,867,903.20/231,717.31
  6. Step 6: Final answer
    x = 179,010.66

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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.