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Finding the Fourth Proportional to 639,897.17, 960,020.78 and 280,002.56

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Solution

The fourth proportional to 639,897.17, 960,020.78 and 280,002.56 is: 420,080.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,897.17 : 960,020.78 = 280,002.56 : x
  2. Step 2: Convert to fraction form
    639,897.17/960,020.78 = 280,002.56/x
  3. Step 3: Cross multiply
    639,897.17x = 960,020.78 × 280,002.56
  4. Step 4: Simplify right side
    639,897.17x = 268,808,269,853.08
  5. Step 5: Solve for x
    x = 268,808,269,853.08/639,897.17
  6. Step 6: Final answer
    x = 420,080.42

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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.