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Finding the Fourth Proportional to 122.86, 169.49 and 73.74

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Solution

The fourth proportional to 122.86, 169.49 and 73.74 is: 101.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.86 : 169.49 = 73.74 : x
  2. Step 2: Convert to fraction form
    122.86/169.49 = 73.74/x
  3. Step 3: Cross multiply
    122.86x = 169.49 × 73.74
  4. Step 4: Simplify right side
    122.86x = 12,497.35
  5. Step 5: Solve for x
    x = 12,497.35/122.86
  6. Step 6: Final answer
    x = 101.72

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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.