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Finding the Fourth Proportional to 122.73, 169.46 and 91.99

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Solution

The fourth proportional to 122.73, 169.46 and 91.99 is: 127.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.73 : 169.46 = 91.99 : x
  2. Step 2: Convert to fraction form
    122.73/169.46 = 91.99/x
  3. Step 3: Cross multiply
    122.73x = 169.46 × 91.99
  4. Step 4: Simplify right side
    122.73x = 15,588.63
  5. Step 5: Solve for x
    x = 15,588.63/122.73
  6. Step 6: Final answer
    x = 127.02

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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.