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Finding the Fourth Proportional to 122.85, 169.39 and 104.15

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Solution

The fourth proportional to 122.85, 169.39 and 104.15 is: 143.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.85 : 169.39 = 104.15 : x
  2. Step 2: Convert to fraction form
    122.85/169.39 = 104.15/x
  3. Step 3: Cross multiply
    122.85x = 169.39 × 104.15
  4. Step 4: Simplify right side
    122.85x = 17,641.81
  5. Step 5: Solve for x
    x = 17,641.81/122.85
  6. Step 6: Final answer
    x = 143.60

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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.