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Finding the Fourth Proportional to 639,895,986.10, 959,843,979.15 and 446,026,309.30

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Solution

The fourth proportional to 639,895,986.10, 959,843,979.15 and 446,026,309.30 is: 669,039,463.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,895,986.10 : 959,843,979.15 = 446,026,309.30 : x
  2. Step 2: Convert to fraction form
    639,895,986.10/959,843,979.15 = 446,026,309.30/x
  3. Step 3: Cross multiply
    639,895,986.10x = 959,843,979.15 × 446,026,309.30
  4. Step 4: Simplify right side
    639,895,986.10x = 428,115,667,524,100,672
  5. Step 5: Solve for x
    x = 428,115,667,524,100,672/639,895,986.10
  6. Step 6: Final answer
    x = 669,039,463.95

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Double scale
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1.5x scale

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.