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Finding the Fourth Proportional to 720,984.38, 994,942.04 and 398,697.12

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Solution

The fourth proportional to 720,984.38, 994,942.04 and 398,697.12 is: 550,192.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,984.38 : 994,942.04 = 398,697.12 : x
  2. Step 2: Convert to fraction form
    720,984.38/994,942.04 = 398,697.12/x
  3. Step 3: Cross multiply
    720,984.38x = 994,942.04 × 398,697.12
  4. Step 4: Simplify right side
    720,984.38x = 396,680,523,921.44
  5. Step 5: Solve for x
    x = 396,680,523,921.44/720,984.38
  6. Step 6: Final answer
    x = 550,192.96

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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.