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Finding the Fourth Proportional to 81,085.44, 121,626.72 and 25,680

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Solution

The fourth proportional to 81,085.44, 121,626.72 and 25,680 is: 38,519.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,085.44 : 121,626.72 = 25,680 : x
  2. Step 2: Convert to fraction form
    81,085.44/121,626.72 = 25,680/x
  3. Step 3: Cross multiply
    81,085.44x = 121,626.72 × 25,680
  4. Step 4: Simplify right side
    81,085.44x = 3,123,374,169.60
  5. Step 5: Solve for x
    x = 3,123,374,169.60/81,085.44
  6. Step 6: Final answer
    x = 38,519.54

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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.