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Finding the Fourth Proportional to 641.19, 961.77 and 178.95

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Solution

The fourth proportional to 641.19, 961.77 and 178.95 is: 268.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.19 : 961.77 = 178.95 : x
  2. Step 2: Convert to fraction form
    641.19/961.77 = 178.95/x
  3. Step 3: Cross multiply
    641.19x = 961.77 × 178.95
  4. Step 4: Simplify right side
    641.19x = 172,108.74
  5. Step 5: Solve for x
    x = 172,108.74/641.19
  6. Step 6: Final answer
    x = 268.42

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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.