Home / 858,785.40-1,288,178.10-485,537.40

Finding the Fourth Proportional to 858,785.40, 1,288,178.10 and 485,537.40

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Solution

The fourth proportional to 858,785.40, 1,288,178.10 and 485,537.40 is: 728,306.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,785.40 : 1,288,178.10 = 485,537.40 : x
  2. Step 2: Convert to fraction form
    858,785.40/1,288,178.10 = 485,537.40/x
  3. Step 3: Cross multiply
    858,785.40x = 1,288,178.10 × 485,537.40
  4. Step 4: Simplify right side
    858,785.40x = 625,458,645,410.94
  5. Step 5: Solve for x
    x = 625,458,645,410.94/858,785.40
  6. Step 6: Final answer
    x = 728,306.10

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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.