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Finding the Fourth Proportional to 178.77, 268.11 and 81.23

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Solution

The fourth proportional to 178.77, 268.11 and 81.23 is: 121.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.77 : 268.11 = 81.23 : x
  2. Step 2: Convert to fraction form
    178.77/268.11 = 81.23/x
  3. Step 3: Cross multiply
    178.77x = 268.11 × 81.23
  4. Step 4: Simplify right side
    178.77x = 21,777.23
  5. Step 5: Solve for x
    x = 21,777.23/178.77
  6. Step 6: Final answer
    x = 121.82

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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.