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Finding the Fourth Proportional to 641.92, 886.05 and 409.18

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Solution

The fourth proportional to 641.92, 886.05 and 409.18 is: 564.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.92 : 886.05 = 409.18 : x
  2. Step 2: Convert to fraction form
    641.92/886.05 = 409.18/x
  3. Step 3: Cross multiply
    641.92x = 886.05 × 409.18
  4. Step 4: Simplify right side
    641.92x = 362,553.94
  5. Step 5: Solve for x
    x = 362,553.94/641.92
  6. Step 6: Final answer
    x = 564.80

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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.