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Finding the Fourth Proportional to 641.27, 961.72 and 270.95

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Solution

The fourth proportional to 641.27, 961.72 and 270.95 is: 406.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.27 : 961.72 = 270.95 : x
  2. Step 2: Convert to fraction form
    641.27/961.72 = 270.95/x
  3. Step 3: Cross multiply
    641.27x = 961.72 × 270.95
  4. Step 4: Simplify right side
    641.27x = 260,574.07
  5. Step 5: Solve for x
    x = 260,574.07/641.27
  6. Step 6: Final answer
    x = 406.34

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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.