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Finding the Fourth Proportional to 641.83, 961.89 and 276.16

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Solution

The fourth proportional to 641.83, 961.89 and 276.16 is: 413.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.83 : 961.89 = 276.16 : x
  2. Step 2: Convert to fraction form
    641.83/961.89 = 276.16/x
  3. Step 3: Cross multiply
    641.83x = 961.89 × 276.16
  4. Step 4: Simplify right side
    641.83x = 265,635.54
  5. Step 5: Solve for x
    x = 265,635.54/641.83
  6. Step 6: Final answer
    x = 413.87

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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.