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Finding the Fourth Proportional to 122.90, 168.93 and 108.26

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Solution

The fourth proportional to 122.90, 168.93 and 108.26 is: 148.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.90 : 168.93 = 108.26 : x
  2. Step 2: Convert to fraction form
    122.90/168.93 = 108.26/x
  3. Step 3: Cross multiply
    122.90x = 168.93 × 108.26
  4. Step 4: Simplify right side
    122.90x = 18,287.82
  5. Step 5: Solve for x
    x = 18,287.82/122.90
  6. Step 6: Final answer
    x = 148.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.