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Finding the Fourth Proportional to 641.92, 885.90 and 362.18

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Solution

The fourth proportional to 641.92, 885.90 and 362.18 is: 499.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.92 : 885.90 = 362.18 : x
  2. Step 2: Convert to fraction form
    641.92/885.90 = 362.18/x
  3. Step 3: Cross multiply
    641.92x = 885.90 × 362.18
  4. Step 4: Simplify right side
    641.92x = 320,855.26
  5. Step 5: Solve for x
    x = 320,855.26/641.92
  6. Step 6: Final answer
    x = 499.84

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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.