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Finding the Fourth Proportional to 641.60, 961.17 and 381.05

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Solution

The fourth proportional to 641.60, 961.17 and 381.05 is: 570.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.60 : 961.17 = 381.05 : x
  2. Step 2: Convert to fraction form
    641.60/961.17 = 381.05/x
  3. Step 3: Cross multiply
    641.60x = 961.17 × 381.05
  4. Step 4: Simplify right side
    641.60x = 366,249.02
  5. Step 5: Solve for x
    x = 366,249.02/641.60
  6. Step 6: Final answer
    x = 570.84

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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.