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Finding the Fourth Proportional to 2,279.13, 3,418.87 and 818.30

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Solution

The fourth proportional to 2,279.13, 3,418.87 and 818.30 is: 1,227.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,279.13 : 3,418.87 = 818.30 : x
  2. Step 2: Convert to fraction form
    2,279.13/3,418.87 = 818.30/x
  3. Step 3: Cross multiply
    2,279.13x = 3,418.87 × 818.30
  4. Step 4: Simplify right side
    2,279.13x = 2,797,661.32
  5. Step 5: Solve for x
    x = 2,797,661.32/2,279.13
  6. Step 6: Final answer
    x = 1,227.51

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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.