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Finding the Fourth Proportional to 178.78, 268.08 and 87.38

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Solution

The fourth proportional to 178.78, 268.08 and 87.38 is: 131.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.78 : 268.08 = 87.38 : x
  2. Step 2: Convert to fraction form
    178.78/268.08 = 87.38/x
  3. Step 3: Cross multiply
    178.78x = 268.08 × 87.38
  4. Step 4: Simplify right side
    178.78x = 23,424.83
  5. Step 5: Solve for x
    x = 23,424.83/178.78
  6. Step 6: Final answer
    x = 131.03

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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.