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Finding the Fourth Proportional to 178.47, 267.64 and 87.21

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Solution

The fourth proportional to 178.47, 267.64 and 87.21 is: 130.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.47 : 267.64 = 87.21 : x
  2. Step 2: Convert to fraction form
    178.47/267.64 = 87.21/x
  3. Step 3: Cross multiply
    178.47x = 267.64 × 87.21
  4. Step 4: Simplify right side
    178.47x = 23,340.67
  5. Step 5: Solve for x
    x = 23,340.67/178.47
  6. Step 6: Final answer
    x = 130.78

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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.