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Finding the Fourth Proportional to 178.76, 268.19 and 81.23

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Solution

The fourth proportional to 178.76, 268.19 and 81.23 is: 121.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.76 : 268.19 = 81.23 : x
  2. Step 2: Convert to fraction form
    178.76/268.19 = 81.23/x
  3. Step 3: Cross multiply
    178.76x = 268.19 × 81.23
  4. Step 4: Simplify right side
    178.76x = 21,785.95
  5. Step 5: Solve for x
    x = 21,785.95/178.76
  6. Step 6: Final answer
    x = 121.87

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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.