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Finding the Fourth Proportional to 111.28, 167.02 and 80.70

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Solution

The fourth proportional to 111.28, 167.02 and 80.70 is: 121.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.28 : 167.02 = 80.70 : x
  2. Step 2: Convert to fraction form
    111.28/167.02 = 80.70/x
  3. Step 3: Cross multiply
    111.28x = 167.02 × 80.70
  4. Step 4: Simplify right side
    111.28x = 13,478.51
  5. Step 5: Solve for x
    x = 13,478.51/111.28
  6. Step 6: Final answer
    x = 121.12

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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.