Home / 811,999.20-1,217,998.80-391,317.60

Finding the Fourth Proportional to 811,999.20, 1,217,998.80 and 391,317.60

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Solution

The fourth proportional to 811,999.20, 1,217,998.80 and 391,317.60 is: 586,976.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,999.20 : 1,217,998.80 = 391,317.60 : x
  2. Step 2: Convert to fraction form
    811,999.20/1,217,998.80 = 391,317.60/x
  3. Step 3: Cross multiply
    811,999.20x = 1,217,998.80 × 391,317.60
  4. Step 4: Simplify right side
    811,999.20x = 476,624,367,218.88
  5. Step 5: Solve for x
    x = 476,624,367,218.88/811,999.20
  6. Step 6: Final answer
    x = 586,976.40

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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.