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Finding the Fourth Proportional to 431,620.20, 647,478.90 and 132,098.40

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Solution

The fourth proportional to 431,620.20, 647,478.90 and 132,098.40 is: 198,162.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,620.20 : 647,478.90 = 132,098.40 : x
  2. Step 2: Convert to fraction form
    431,620.20/647,478.90 = 132,098.40/x
  3. Step 3: Cross multiply
    431,620.20x = 647,478.90 × 132,098.40
  4. Step 4: Simplify right side
    431,620.20x = 85,530,926,723.76
  5. Step 5: Solve for x
    x = 85,530,926,723.76/431,620.20
  6. Step 6: Final answer
    x = 198,162.47

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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.