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Finding the Fourth Proportional to 641,138.69, 961,658.12 and 261,958.46

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Solution

The fourth proportional to 641,138.69, 961,658.12 and 261,958.46 is: 392,917.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,138.69 : 961,658.12 = 261,958.46 : x
  2. Step 2: Convert to fraction form
    641,138.69/961,658.12 = 261,958.46/x
  3. Step 3: Cross multiply
    641,138.69x = 961,658.12 × 261,958.46
  4. Step 4: Simplify right side
    641,138.69x = 251,914,476,008.30
  5. Step 5: Solve for x
    x = 251,914,476,008.30/641,138.69
  6. Step 6: Final answer
    x = 392,917.29

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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.