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Finding the Fourth Proportional to 122.16, 168.70 and 104.57

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Solution

The fourth proportional to 122.16, 168.70 and 104.57 is: 144.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.16 : 168.70 = 104.57 : x
  2. Step 2: Convert to fraction form
    122.16/168.70 = 104.57/x
  3. Step 3: Cross multiply
    122.16x = 168.70 × 104.57
  4. Step 4: Simplify right side
    122.16x = 17,640.86
  5. Step 5: Solve for x
    x = 17,640.86/122.16
  6. Step 6: Final answer
    x = 144.41

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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.