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Finding the Fourth Proportional to 112.10, 169.05 and 111.38

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Solution

The fourth proportional to 112.10, 169.05 and 111.38 is: 167.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.10 : 169.05 = 111.38 : x
  2. Step 2: Convert to fraction form
    112.10/169.05 = 111.38/x
  3. Step 3: Cross multiply
    112.10x = 169.05 × 111.38
  4. Step 4: Simplify right side
    112.10x = 18,828.79
  5. Step 5: Solve for x
    x = 18,828.79/112.10
  6. Step 6: Final answer
    x = 167.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.