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Finding the Fourth Proportional to 814.42, 1,221.62 and 198.13

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Solution

The fourth proportional to 814.42, 1,221.62 and 198.13 is: 297.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.42 : 1,221.62 = 198.13 : x
  2. Step 2: Convert to fraction form
    814.42/1,221.62 = 198.13/x
  3. Step 3: Cross multiply
    814.42x = 1,221.62 × 198.13
  4. Step 4: Simplify right side
    814.42x = 242,033.46
  5. Step 5: Solve for x
    x = 242,033.46/814.42
  6. Step 6: Final answer
    x = 297.19

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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.