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Finding the Fourth Proportional to 122.31, 168.45 and 112.07

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Solution

The fourth proportional to 122.31, 168.45 and 112.07 is: 154.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.31 : 168.45 = 112.07 : x
  2. Step 2: Convert to fraction form
    122.31/168.45 = 112.07/x
  3. Step 3: Cross multiply
    122.31x = 168.45 × 112.07
  4. Step 4: Simplify right side
    122.31x = 18,877.35
  5. Step 5: Solve for x
    x = 18,877.35/122.31
  6. Step 6: Final answer
    x = 154.34

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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.