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Finding the Fourth Proportional to 720,469.80, 1,081,319.10 and 321,724.20

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Solution

The fourth proportional to 720,469.80, 1,081,319.10 and 321,724.20 is: 482,860.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,469.80 : 1,081,319.10 = 321,724.20 : x
  2. Step 2: Convert to fraction form
    720,469.80/1,081,319.10 = 321,724.20/x
  3. Step 3: Cross multiply
    720,469.80x = 1,081,319.10 × 321,724.20
  4. Step 4: Simplify right side
    720,469.80x = 347,886,522,392.22
  5. Step 5: Solve for x
    x = 347,886,522,392.22/720,469.80
  6. Step 6: Final answer
    x = 482,860.66

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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.