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Finding the Fourth Proportional to 472,392,979.80, 708,589,469.70 and 326,990,722.20

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Solution

The fourth proportional to 472,392,979.80, 708,589,469.70 and 326,990,722.20 is: 490,486,083.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    472,392,979.80 : 708,589,469.70 = 326,990,722.20 : x
  2. Step 2: Convert to fraction form
    472,392,979.80/708,589,469.70 = 326,990,722.20/x
  3. Step 3: Cross multiply
    472,392,979.80x = 708,589,469.70 × 326,990,722.20
  4. Step 4: Simplify right side
    472,392,979.80x = 231,702,182,440,518,016
  5. Step 5: Solve for x
    x = 231,702,182,440,518,016/472,392,979.80
  6. Step 6: Final answer
    x = 490,486,083.30

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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.