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Finding the Fourth Proportional to 814.50, 1,221.74 and 198.20

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Solution

The fourth proportional to 814.50, 1,221.74 and 198.20 is: 297.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.50 : 1,221.74 = 198.20 : x
  2. Step 2: Convert to fraction form
    814.50/1,221.74 = 198.20/x
  3. Step 3: Cross multiply
    814.50x = 1,221.74 × 198.20
  4. Step 4: Simplify right side
    814.50x = 242,152.79
  5. Step 5: Solve for x
    x = 242,152.79/814.50
  6. Step 6: Final answer
    x = 297.30

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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.