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Finding the Fourth Proportional to 2,279.48, 3,419.28 and 818.78

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Solution

The fourth proportional to 2,279.48, 3,419.28 and 818.78 is: 1,228.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,279.48 : 3,419.28 = 818.78 : x
  2. Step 2: Convert to fraction form
    2,279.48/3,419.28 = 818.78/x
  3. Step 3: Cross multiply
    2,279.48x = 3,419.28 × 818.78
  4. Step 4: Simplify right side
    2,279.48x = 2,799,638.08
  5. Step 5: Solve for x
    x = 2,799,638.08/2,279.48
  6. Step 6: Final answer
    x = 1,228.19

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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.