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Finding the Fourth Proportional to 721,027.20, 994,998.72 and 398,728.32

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Solution

The fourth proportional to 721,027.20, 994,998.72 and 398,728.32 is: 550,234.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,027.20 : 994,998.72 = 398,728.32 : x
  2. Step 2: Convert to fraction form
    721,027.20/994,998.72 = 398,728.32/x
  3. Step 3: Cross multiply
    721,027.20x = 994,998.72 × 398,728.32
  4. Step 4: Simplify right side
    721,027.20x = 396,734,168,027.75
  5. Step 5: Solve for x
    x = 396,734,168,027.75/721,027.20
  6. Step 6: Final answer
    x = 550,234.68

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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.