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Finding the Fourth Proportional to 641.48, 961.42 and 275.85

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Solution

The fourth proportional to 641.48, 961.42 and 275.85 is: 413.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.48 : 961.42 = 275.85 : x
  2. Step 2: Convert to fraction form
    641.48/961.42 = 275.85/x
  3. Step 3: Cross multiply
    641.48x = 961.42 × 275.85
  4. Step 4: Simplify right side
    641.48x = 265,207.71
  5. Step 5: Solve for x
    x = 265,207.71/641.48
  6. Step 6: Final answer
    x = 413.43

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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.