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Finding the Fourth Proportional to 123,879.28, 170,949.78 and 67,290.52

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Solution

The fourth proportional to 123,879.28, 170,949.78 and 67,290.52 is: 92,858.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,879.28 : 170,949.78 = 67,290.52 : x
  2. Step 2: Convert to fraction form
    123,879.28/170,949.78 = 67,290.52/x
  3. Step 3: Cross multiply
    123,879.28x = 170,949.78 × 67,290.52
  4. Step 4: Simplify right side
    123,879.28x = 11,503,299,590.09
  5. Step 5: Solve for x
    x = 11,503,299,590.09/123,879.28
  6. Step 6: Final answer
    x = 92,858.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.