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Finding the Fourth Proportional to 639,841.26, 959,941.26 and 280,043.47

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Solution

The fourth proportional to 639,841.26, 959,941.26 and 280,043.47 is: 420,143.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,841.26 : 959,941.26 = 280,043.47 : x
  2. Step 2: Convert to fraction form
    639,841.26/959,941.26 = 280,043.47/x
  3. Step 3: Cross multiply
    639,841.26x = 959,941.26 × 280,043.47
  4. Step 4: Simplify right side
    639,841.26x = 268,825,282,646.50
  5. Step 5: Solve for x
    x = 268,825,282,646.50/639,841.26
  6. Step 6: Final answer
    x = 420,143.71

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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.