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Finding the Fourth Proportional to 720,785.57, 994,704.85 and 398,516.47

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Solution

The fourth proportional to 720,785.57, 994,704.85 and 398,516.47 is: 549,964.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,785.57 : 994,704.85 = 398,516.47 : x
  2. Step 2: Convert to fraction form
    720,785.57/994,704.85 = 398,516.47/x
  3. Step 3: Cross multiply
    720,785.57x = 994,704.85 × 398,516.47
  4. Step 4: Simplify right side
    720,785.57x = 396,406,265,513.88
  5. Step 5: Solve for x
    x = 396,406,265,513.88/720,785.57
  6. Step 6: Final answer
    x = 549,964.21

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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.