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Finding the Fourth Proportional to 813.11, 1,218.73 and 344.29

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Solution

The fourth proportional to 813.11, 1,218.73 and 344.29 is: 516.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.11 : 1,218.73 = 344.29 : x
  2. Step 2: Convert to fraction form
    813.11/1,218.73 = 344.29/x
  3. Step 3: Cross multiply
    813.11x = 1,218.73 × 344.29
  4. Step 4: Simplify right side
    813.11x = 419,590.89
  5. Step 5: Solve for x
    x = 419,590.89/813.11
  6. Step 6: Final answer
    x = 516.04

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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.