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Finding the Fourth Proportional to 178.40, 267.39 and 86.87

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Solution

The fourth proportional to 178.40, 267.39 and 86.87 is: 130.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.40 : 267.39 = 86.87 : x
  2. Step 2: Convert to fraction form
    178.40/267.39 = 86.87/x
  3. Step 3: Cross multiply
    178.40x = 267.39 × 86.87
  4. Step 4: Simplify right side
    178.40x = 23,228.84
  5. Step 5: Solve for x
    x = 23,228.84/178.40
  6. Step 6: Final answer
    x = 130.20

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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.