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Finding the Fourth Proportional to 122.46, 169.03 and 80.99

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Solution

The fourth proportional to 122.46, 169.03 and 80.99 is: 111.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.46 : 169.03 = 80.99 : x
  2. Step 2: Convert to fraction form
    122.46/169.03 = 80.99/x
  3. Step 3: Cross multiply
    122.46x = 169.03 × 80.99
  4. Step 4: Simplify right side
    122.46x = 13,689.33
  5. Step 5: Solve for x
    x = 13,689.33/122.46
  6. Step 6: Final answer
    x = 111.79

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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.