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Finding the Fourth Proportional to 178.49, 267.82 and 87.21

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Solution

The fourth proportional to 178.49, 267.82 and 87.21 is: 130.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.49 : 267.82 = 87.21 : x
  2. Step 2: Convert to fraction form
    178.49/267.82 = 87.21/x
  3. Step 3: Cross multiply
    178.49x = 267.82 × 87.21
  4. Step 4: Simplify right side
    178.49x = 23,356.36
  5. Step 5: Solve for x
    x = 23,356.36/178.49
  6. Step 6: Final answer
    x = 130.85

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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.