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Finding the Fourth Proportional to 641.56, 961.69 and 410.71

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Solution

The fourth proportional to 641.56, 961.69 and 410.71 is: 615.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.56 : 961.69 = 410.71 : x
  2. Step 2: Convert to fraction form
    641.56/961.69 = 410.71/x
  3. Step 3: Cross multiply
    641.56x = 961.69 × 410.71
  4. Step 4: Simplify right side
    641.56x = 394,975.70
  5. Step 5: Solve for x
    x = 394,975.70/641.56
  6. Step 6: Final answer
    x = 615.65

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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.