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Finding the Fourth Proportional to 813.39, 1,218.14 and 519.97

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Solution

The fourth proportional to 813.39, 1,218.14 and 519.97 is: 778.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.39 : 1,218.14 = 519.97 : x
  2. Step 2: Convert to fraction form
    813.39/1,218.14 = 519.97/x
  3. Step 3: Cross multiply
    813.39x = 1,218.14 × 519.97
  4. Step 4: Simplify right side
    813.39x = 633,394.84
  5. Step 5: Solve for x
    x = 633,394.84/813.39
  6. Step 6: Final answer
    x = 778.71

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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.