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Finding the Fourth Proportional to 814.56, 1,221.96 and 424

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Solution

The fourth proportional to 814.56, 1,221.96 and 424 is: 636.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.56 : 1,221.96 = 424 : x
  2. Step 2: Convert to fraction form
    814.56/1,221.96 = 424/x
  3. Step 3: Cross multiply
    814.56x = 1,221.96 × 424
  4. Step 4: Simplify right side
    814.56x = 518,111.04
  5. Step 5: Solve for x
    x = 518,111.04/814.56
  6. Step 6: Final answer
    x = 636.06

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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.