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Finding the Fourth Proportional to 111.92, 154.25 and 99.19

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Solution

The fourth proportional to 111.92, 154.25 and 99.19 is: 136.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.92 : 154.25 = 99.19 : x
  2. Step 2: Convert to fraction form
    111.92/154.25 = 99.19/x
  3. Step 3: Cross multiply
    111.92x = 154.25 × 99.19
  4. Step 4: Simplify right side
    111.92x = 15,299.92
  5. Step 5: Solve for x
    x = 15,299.92/111.92
  6. Step 6: Final answer
    x = 136.70

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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.