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Finding the Fourth Proportional to 122.85, 169.74 and 98.46

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Solution

The fourth proportional to 122.85, 169.74 and 98.46 is: 136.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.85 : 169.74 = 98.46 : x
  2. Step 2: Convert to fraction form
    122.85/169.74 = 98.46/x
  3. Step 3: Cross multiply
    122.85x = 169.74 × 98.46
  4. Step 4: Simplify right side
    122.85x = 16,712.60
  5. Step 5: Solve for x
    x = 16,712.60/122.85
  6. Step 6: Final answer
    x = 136.04

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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.