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Finding the Fourth Proportional to 178.77, 268.21 and 81.30

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Solution

The fourth proportional to 178.77, 268.21 and 81.30 is: 121.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.77 : 268.21 = 81.30 : x
  2. Step 2: Convert to fraction form
    178.77/268.21 = 81.30/x
  3. Step 3: Cross multiply
    178.77x = 268.21 × 81.30
  4. Step 4: Simplify right side
    178.77x = 21,805.47
  5. Step 5: Solve for x
    x = 21,805.47/178.77
  6. Step 6: Final answer
    x = 121.98

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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.