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Finding the Fourth Proportional to 113.07, 168.79 and 111.91

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Solution

The fourth proportional to 113.07, 168.79 and 111.91 is: 167.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.07 : 168.79 = 111.91 : x
  2. Step 2: Convert to fraction form
    113.07/168.79 = 111.91/x
  3. Step 3: Cross multiply
    113.07x = 168.79 × 111.91
  4. Step 4: Simplify right side
    113.07x = 18,889.57
  5. Step 5: Solve for x
    x = 18,889.57/113.07
  6. Step 6: Final answer
    x = 167.07

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.