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Finding the Fourth Proportional to 814.82, 1,222.56 and 403.74

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Solution

The fourth proportional to 814.82, 1,222.56 and 403.74 is: 605.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.82 : 1,222.56 = 403.74 : x
  2. Step 2: Convert to fraction form
    814.82/1,222.56 = 403.74/x
  3. Step 3: Cross multiply
    814.82x = 1,222.56 × 403.74
  4. Step 4: Simplify right side
    814.82x = 493,596.37
  5. Step 5: Solve for x
    x = 493,596.37/814.82
  6. Step 6: Final answer
    x = 605.78

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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.