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Finding the Fourth Proportional to 492.78, 738.87 and 218.73

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Solution

The fourth proportional to 492.78, 738.87 and 218.73 is: 327.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.78 : 738.87 = 218.73 : x
  2. Step 2: Convert to fraction form
    492.78/738.87 = 218.73/x
  3. Step 3: Cross multiply
    492.78x = 738.87 × 218.73
  4. Step 4: Simplify right side
    492.78x = 161,613.04
  5. Step 5: Solve for x
    x = 161,613.04/492.78
  6. Step 6: Final answer
    x = 327.96

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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.