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Finding the Fourth Proportional to 1,281.92, 1,919.22 and 1,179.86

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Solution

The fourth proportional to 1,281.92, 1,919.22 and 1,179.86 is: 1,766.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.92 : 1,919.22 = 1,179.86 : x
  2. Step 2: Convert to fraction form
    1,281.92/1,919.22 = 1,179.86/x
  3. Step 3: Cross multiply
    1,281.92x = 1,919.22 × 1,179.86
  4. Step 4: Simplify right side
    1,281.92x = 2,264,410.91
  5. Step 5: Solve for x
    x = 2,264,410.91/1,281.92
  6. Step 6: Final answer
    x = 1,766.42

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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.