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Finding the Fourth Proportional to 641.31, 885.08 and 379.35

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Solution

The fourth proportional to 641.31, 885.08 and 379.35 is: 523.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.31 : 885.08 = 379.35 : x
  2. Step 2: Convert to fraction form
    641.31/885.08 = 379.35/x
  3. Step 3: Cross multiply
    641.31x = 885.08 × 379.35
  4. Step 4: Simplify right side
    641.31x = 335,755.10
  5. Step 5: Solve for x
    x = 335,755.10/641.31
  6. Step 6: Final answer
    x = 523.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.