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Finding the Fourth Proportional to 178.89, 268.38 and 81.36

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Solution

The fourth proportional to 178.89, 268.38 and 81.36 is: 122.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.89 : 268.38 = 81.36 : x
  2. Step 2: Convert to fraction form
    178.89/268.38 = 81.36/x
  3. Step 3: Cross multiply
    178.89x = 268.38 × 81.36
  4. Step 4: Simplify right side
    178.89x = 21,834.05
  5. Step 5: Solve for x
    x = 21,834.05/178.89
  6. Step 6: Final answer
    x = 122.06

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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.