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Finding the Fourth Proportional to 122.55, 168.79 and 113.74

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Solution

The fourth proportional to 122.55, 168.79 and 113.74 is: 156.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.55 : 168.79 = 113.74 : x
  2. Step 2: Convert to fraction form
    122.55/168.79 = 113.74/x
  3. Step 3: Cross multiply
    122.55x = 168.79 × 113.74
  4. Step 4: Simplify right side
    122.55x = 19,198.31
  5. Step 5: Solve for x
    x = 19,198.31/122.55
  6. Step 6: Final answer
    x = 156.65

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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.