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Finding the Fourth Proportional to 2,279.86, 3,418.81 and 719.48

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Solution

The fourth proportional to 2,279.86, 3,418.81 and 719.48 is: 1,078.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,279.86 : 3,418.81 = 719.48 : x
  2. Step 2: Convert to fraction form
    2,279.86/3,418.81 = 719.48/x
  3. Step 3: Cross multiply
    2,279.86x = 3,418.81 × 719.48
  4. Step 4: Simplify right side
    2,279.86x = 2,459,765.42
  5. Step 5: Solve for x
    x = 2,459,765.42/2,279.86
  6. Step 6: Final answer
    x = 1,078.91

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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.