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Finding the Fourth Proportional to 431,432.80, 647,149.20 and 115,921.60

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Solution

The fourth proportional to 431,432.80, 647,149.20 and 115,921.60 is: 173,882.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,432.80 : 647,149.20 = 115,921.60 : x
  2. Step 2: Convert to fraction form
    431,432.80/647,149.20 = 115,921.60/x
  3. Step 3: Cross multiply
    431,432.80x = 647,149.20 × 115,921.60
  4. Step 4: Simplify right side
    431,432.80x = 75,018,570,702.72
  5. Step 5: Solve for x
    x = 75,018,570,702.72/431,432.80
  6. Step 6: Final answer
    x = 173,882.40

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Similar ratio
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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.