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Finding the Fourth Proportional to 178.59, 267.87 and 87.21

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Solution

The fourth proportional to 178.59, 267.87 and 87.21 is: 130.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.59 : 267.87 = 87.21 : x
  2. Step 2: Convert to fraction form
    178.59/267.87 = 87.21/x
  3. Step 3: Cross multiply
    178.59x = 267.87 × 87.21
  4. Step 4: Simplify right side
    178.59x = 23,362.03
  5. Step 5: Solve for x
    x = 23,362.03/178.59
  6. Step 6: Final answer
    x = 130.82

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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.