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Finding the Fourth Proportional to 431,488.87, 647,129.49 and 131,972.04

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Solution

The fourth proportional to 431,488.87, 647,129.49 and 131,972.04 is: 197,926.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,488.87 : 647,129.49 = 131,972.04 : x
  2. Step 2: Convert to fraction form
    431,488.87/647,129.49 = 131,972.04/x
  3. Step 3: Cross multiply
    431,488.87x = 647,129.49 × 131,972.04
  4. Step 4: Simplify right side
    431,488.87x = 85,402,998,939.46
  5. Step 5: Solve for x
    x = 85,402,998,939.46/431,488.87
  6. Step 6: Final answer
    x = 197,926.31

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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.