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Finding the Fourth Proportional to 814.42, 1,221.61 and 403.82

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Solution

The fourth proportional to 814.42, 1,221.61 and 403.82 is: 605.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.42 : 1,221.61 = 403.82 : x
  2. Step 2: Convert to fraction form
    814.42/1,221.61 = 403.82/x
  3. Step 3: Cross multiply
    814.42x = 1,221.61 × 403.82
  4. Step 4: Simplify right side
    814.42x = 493,310.55
  5. Step 5: Solve for x
    x = 493,310.55/814.42
  6. Step 6: Final answer
    x = 605.72

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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.