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Finding the Fourth Proportional to 178.89, 268.11 and 87.54

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Solution

The fourth proportional to 178.89, 268.11 and 87.54 is: 131.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.89 : 268.11 = 87.54 : x
  2. Step 2: Convert to fraction form
    178.89/268.11 = 87.54/x
  3. Step 3: Cross multiply
    178.89x = 268.11 × 87.54
  4. Step 4: Simplify right side
    178.89x = 23,470.35
  5. Step 5: Solve for x
    x = 23,470.35/178.89
  6. Step 6: Final answer
    x = 131.20

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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.