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Finding the Fourth Proportional to 663.18, 994.79 and 218.53

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Solution

The fourth proportional to 663.18, 994.79 and 218.53 is: 327.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.18 : 994.79 = 218.53 : x
  2. Step 2: Convert to fraction form
    663.18/994.79 = 218.53/x
  3. Step 3: Cross multiply
    663.18x = 994.79 × 218.53
  4. Step 4: Simplify right side
    663.18x = 217,391.46
  5. Step 5: Solve for x
    x = 217,391.46/663.18
  6. Step 6: Final answer
    x = 327.80

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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.