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Finding the Fourth Proportional to 641.44, 961.71 and 380.83

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Solution

The fourth proportional to 641.44, 961.71 and 380.83 is: 570.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.44 : 961.71 = 380.83 : x
  2. Step 2: Convert to fraction form
    641.44/961.71 = 380.83/x
  3. Step 3: Cross multiply
    641.44x = 961.71 × 380.83
  4. Step 4: Simplify right side
    641.44x = 366,243.29
  5. Step 5: Solve for x
    x = 366,243.29/641.44
  6. Step 6: Final answer
    x = 570.97

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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.