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Finding the Fourth Proportional to 814.89, 1,222.39 and 403.61

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Solution

The fourth proportional to 814.89, 1,222.39 and 403.61 is: 605.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.89 : 1,222.39 = 403.61 : x
  2. Step 2: Convert to fraction form
    814.89/1,222.39 = 403.61/x
  3. Step 3: Cross multiply
    814.89x = 1,222.39 × 403.61
  4. Step 4: Simplify right side
    814.89x = 493,366.66
  5. Step 5: Solve for x
    x = 493,366.66/814.89
  6. Step 6: Final answer
    x = 605.44

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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.