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Finding the Fourth Proportional to 431,800.20, 647,117.10 and 289,240.20

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Solution

The fourth proportional to 431,800.20, 647,117.10 and 289,240.20 is: 433,469.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,800.20 : 647,117.10 = 289,240.20 : x
  2. Step 2: Convert to fraction form
    431,800.20/647,117.10 = 289,240.20/x
  3. Step 3: Cross multiply
    431,800.20x = 647,117.10 × 289,240.20
  4. Step 4: Simplify right side
    431,800.20x = 187,172,279,427.42
  5. Step 5: Solve for x
    x = 187,172,279,427.42/431,800.20
  6. Step 6: Final answer
    x = 433,469.65

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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.