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Finding the Fourth Proportional to 814.98, 1,221.39 and 609.06

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Solution

The fourth proportional to 814.98, 1,221.39 and 609.06 is: 912.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.98 : 1,221.39 = 609.06 : x
  2. Step 2: Convert to fraction form
    814.98/1,221.39 = 609.06/x
  3. Step 3: Cross multiply
    814.98x = 1,221.39 × 609.06
  4. Step 4: Simplify right side
    814.98x = 743,899.79
  5. Step 5: Solve for x
    x = 743,899.79/814.98
  6. Step 6: Final answer
    x = 912.78

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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.