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Finding the Fourth Proportional to 178.78, 268.16 and 87.45

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Solution

The fourth proportional to 178.78, 268.16 and 87.45 is: 131.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.78 : 268.16 = 87.45 : x
  2. Step 2: Convert to fraction form
    178.78/268.16 = 87.45/x
  3. Step 3: Cross multiply
    178.78x = 268.16 × 87.45
  4. Step 4: Simplify right side
    178.78x = 23,449.25
  5. Step 5: Solve for x
    x = 23,449.25/178.78
  6. Step 6: Final answer
    x = 131.17

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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.