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Finding the Fourth Proportional to 809,319.20, 1,213,978.80 and 431,405.60

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Solution

The fourth proportional to 809,319.20, 1,213,978.80 and 431,405.60 is: 647,108.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,319.20 : 1,213,978.80 = 431,405.60 : x
  2. Step 2: Convert to fraction form
    809,319.20/1,213,978.80 = 431,405.60/x
  3. Step 3: Cross multiply
    809,319.20x = 1,213,978.80 × 431,405.60
  4. Step 4: Simplify right side
    809,319.20x = 523,717,252,601.28
  5. Step 5: Solve for x
    x = 523,717,252,601.28/809,319.20
  6. Step 6: Final answer
    x = 647,108.40

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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.