Home / 812,000.20-1,218,000.30-391,318.60

Finding the Fourth Proportional to 812,000.20, 1,218,000.30 and 391,318.60

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Solution

The fourth proportional to 812,000.20, 1,218,000.30 and 391,318.60 is: 586,977.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,000.20 : 1,218,000.30 = 391,318.60 : x
  2. Step 2: Convert to fraction form
    812,000.20/1,218,000.30 = 391,318.60/x
  3. Step 3: Cross multiply
    812,000.20x = 1,218,000.30 × 391,318.60
  4. Step 4: Simplify right side
    812,000.20x = 476,626,172,195.58
  5. Step 5: Solve for x
    x = 476,626,172,195.58/812,000.20
  6. Step 6: Final answer
    x = 586,977.90

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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.