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Finding the Fourth Proportional to 138,001.20, 207,001.80 and 129,836.40

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Solution

The fourth proportional to 138,001.20, 207,001.80 and 129,836.40 is: 194,754.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,001.20 : 207,001.80 = 129,836.40 : x
  2. Step 2: Convert to fraction form
    138,001.20/207,001.80 = 129,836.40/x
  3. Step 3: Cross multiply
    138,001.20x = 207,001.80 × 129,836.40
  4. Step 4: Simplify right side
    138,001.20x = 26,876,368,505.52
  5. Step 5: Solve for x
    x = 26,876,368,505.52/138,001.20
  6. Step 6: Final answer
    x = 194,754.60

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1.5x scale

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.