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Finding the Fourth Proportional to 120.84, 166.70 and 91.78

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Solution

The fourth proportional to 120.84, 166.70 and 91.78 is: 126.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.84 : 166.70 = 91.78 : x
  2. Step 2: Convert to fraction form
    120.84/166.70 = 91.78/x
  3. Step 3: Cross multiply
    120.84x = 166.70 × 91.78
  4. Step 4: Simplify right side
    120.84x = 15,299.73
  5. Step 5: Solve for x
    x = 15,299.73/120.84
  6. Step 6: Final answer
    x = 126.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.