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Finding the Fourth Proportional to 113.02, 169.38 and 80.92

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Solution

The fourth proportional to 113.02, 169.38 and 80.92 is: 121.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.02 : 169.38 = 80.92 : x
  2. Step 2: Convert to fraction form
    113.02/169.38 = 80.92/x
  3. Step 3: Cross multiply
    113.02x = 169.38 × 80.92
  4. Step 4: Simplify right side
    113.02x = 13,706.23
  5. Step 5: Solve for x
    x = 13,706.23/113.02
  6. Step 6: Final answer
    x = 121.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.