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Finding the Fourth Proportional to 431,638.80, 647,458.20 and 386,149.20

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Solution

The fourth proportional to 431,638.80, 647,458.20 and 386,149.20 is: 579,223.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,638.80 : 647,458.20 = 386,149.20 : x
  2. Step 2: Convert to fraction form
    431,638.80/647,458.20 = 386,149.20/x
  3. Step 3: Cross multiply
    431,638.80x = 647,458.20 × 386,149.20
  4. Step 4: Simplify right side
    431,638.80x = 250,015,465,963.44
  5. Step 5: Solve for x
    x = 250,015,465,963.44/431,638.80
  6. Step 6: Final answer
    x = 579,223.80

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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.