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Finding the Fourth Proportional to 641.45, 885.19 and 379.55

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Solution

The fourth proportional to 641.45, 885.19 and 379.55 is: 523.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.45 : 885.19 = 379.55 : x
  2. Step 2: Convert to fraction form
    641.45/885.19 = 379.55/x
  3. Step 3: Cross multiply
    641.45x = 885.19 × 379.55
  4. Step 4: Simplify right side
    641.45x = 335,971.97
  5. Step 5: Solve for x
    x = 335,971.97/641.45
  6. Step 6: Final answer
    x = 523.77

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1.5x scale

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.