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Finding the Fourth Proportional to 870,169.20, 1,305,253.80 and 515,000.40

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Solution

The fourth proportional to 870,169.20, 1,305,253.80 and 515,000.40 is: 772,500.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    870,169.20 : 1,305,253.80 = 515,000.40 : x
  2. Step 2: Convert to fraction form
    870,169.20/1,305,253.80 = 515,000.40/x
  3. Step 3: Cross multiply
    870,169.20x = 1,305,253.80 × 515,000.40
  4. Step 4: Simplify right side
    870,169.20x = 672,206,229,101.52
  5. Step 5: Solve for x
    x = 672,206,229,101.52/870,169.20
  6. Step 6: Final answer
    x = 772,500.60

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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.