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Finding the Fourth Proportional to 431,720.80, 647,581.20 and 394,979.20

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Solution

The fourth proportional to 431,720.80, 647,581.20 and 394,979.20 is: 592,468.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,720.80 : 647,581.20 = 394,979.20 : x
  2. Step 2: Convert to fraction form
    431,720.80/647,581.20 = 394,979.20/x
  3. Step 3: Cross multiply
    431,720.80x = 647,581.20 × 394,979.20
  4. Step 4: Simplify right side
    431,720.80x = 255,781,104,311.04
  5. Step 5: Solve for x
    x = 255,781,104,311.04/431,720.80
  6. Step 6: Final answer
    x = 592,468.80

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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.