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Finding the Fourth Proportional to 664,517.80, 996,776.70 and 428,127.40

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Solution

The fourth proportional to 664,517.80, 996,776.70 and 428,127.40 is: 642,191.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,517.80 : 996,776.70 = 428,127.40 : x
  2. Step 2: Convert to fraction form
    664,517.80/996,776.70 = 428,127.40/x
  3. Step 3: Cross multiply
    664,517.80x = 996,776.70 × 428,127.40
  4. Step 4: Simplify right side
    664,517.80x = 426,747,416,951.58
  5. Step 5: Solve for x
    x = 426,747,416,951.58/664,517.80
  6. Step 6: Final answer
    x = 642,191.10

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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.