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Finding the Fourth Proportional to 431,640.80, 647,461.20 and 386,151.20

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Solution

The fourth proportional to 431,640.80, 647,461.20 and 386,151.20 is: 579,226.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,640.80 : 647,461.20 = 386,151.20 : x
  2. Step 2: Convert to fraction form
    431,640.80/647,461.20 = 386,151.20/x
  3. Step 3: Cross multiply
    431,640.80x = 647,461.20 × 386,151.20
  4. Step 4: Simplify right side
    431,640.80x = 250,017,919,333.44
  5. Step 5: Solve for x
    x = 250,017,919,333.44/431,640.80
  6. Step 6: Final answer
    x = 579,226.80

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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.