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Finding the Fourth Proportional to 814.96, 1,221.76 and 449.76

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Solution

The fourth proportional to 814.96, 1,221.76 and 449.76 is: 674.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.96 : 1,221.76 = 449.76 : x
  2. Step 2: Convert to fraction form
    814.96/1,221.76 = 449.76/x
  3. Step 3: Cross multiply
    814.96x = 1,221.76 × 449.76
  4. Step 4: Simplify right side
    814.96x = 549,498.78
  5. Step 5: Solve for x
    x = 549,498.78/814.96
  6. Step 6: Final answer
    x = 674.26

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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.