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Finding the Fourth Proportional to 641.71, 961.92 and 312.43

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Solution

The fourth proportional to 641.71, 961.92 and 312.43 is: 468.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.71 : 961.92 = 312.43 : x
  2. Step 2: Convert to fraction form
    641.71/961.92 = 312.43/x
  3. Step 3: Cross multiply
    641.71x = 961.92 × 312.43
  4. Step 4: Simplify right side
    641.71x = 300,532.67
  5. Step 5: Solve for x
    x = 300,532.67/641.71
  6. Step 6: Final answer
    x = 468.33

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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.