Home / 812,003.20-1,218,004.80-391,321.60

Finding the Fourth Proportional to 812,003.20, 1,218,004.80 and 391,321.60

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Solution

The fourth proportional to 812,003.20, 1,218,004.80 and 391,321.60 is: 586,982.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,003.20 : 1,218,004.80 = 391,321.60 : x
  2. Step 2: Convert to fraction form
    812,003.20/1,218,004.80 = 391,321.60/x
  3. Step 3: Cross multiply
    812,003.20x = 1,218,004.80 × 391,321.60
  4. Step 4: Simplify right side
    812,003.20x = 476,631,587,143.68
  5. Step 5: Solve for x
    x = 476,631,587,143.68/812,003.20
  6. Step 6: Final answer
    x = 586,982.40

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Double scale
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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.