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Finding the Fourth Proportional to 647,489.20, 971,233.80 and 423,540.40

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Solution

The fourth proportional to 647,489.20, 971,233.80 and 423,540.40 is: 635,310.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,489.20 : 971,233.80 = 423,540.40 : x
  2. Step 2: Convert to fraction form
    647,489.20/971,233.80 = 423,540.40/x
  3. Step 3: Cross multiply
    647,489.20x = 971,233.80 × 423,540.40
  4. Step 4: Simplify right side
    647,489.20x = 411,356,752,145.52
  5. Step 5: Solve for x
    x = 411,356,752,145.52/647,489.20
  6. Step 6: Final answer
    x = 635,310.60

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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.