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Finding the Fourth Proportional to 639,843.76, 959,945.01 and 280,045.97

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Solution

The fourth proportional to 639,843.76, 959,945.01 and 280,045.97 is: 420,147.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,843.76 : 959,945.01 = 280,045.97 : x
  2. Step 2: Convert to fraction form
    639,843.76/959,945.01 = 280,045.97/x
  3. Step 3: Cross multiply
    639,843.76x = 959,945.01 × 280,045.97
  4. Step 4: Simplify right side
    639,843.76x = 268,828,731,472.11
  5. Step 5: Solve for x
    x = 268,828,731,472.11/639,843.76
  6. Step 6: Final answer
    x = 420,147.46

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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.