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Finding the Fourth Proportional to 720,769.86, 994,683.17 and 398,500.76

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Solution

The fourth proportional to 720,769.86, 994,683.17 and 398,500.76 is: 549,942.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,769.86 : 994,683.17 = 398,500.76 : x
  2. Step 2: Convert to fraction form
    720,769.86/994,683.17 = 398,500.76/x
  3. Step 3: Cross multiply
    720,769.86x = 994,683.17 × 398,500.76
  4. Step 4: Simplify right side
    720,769.86x = 396,382,002,687.17
  5. Step 5: Solve for x
    x = 396,382,002,687.17/720,769.86
  6. Step 6: Final answer
    x = 549,942.53

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.