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Finding the Fourth Proportional to 111.79, 154.18 and 98.69

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Solution

The fourth proportional to 111.79, 154.18 and 98.69 is: 136.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.79 : 154.18 = 98.69 : x
  2. Step 2: Convert to fraction form
    111.79/154.18 = 98.69/x
  3. Step 3: Cross multiply
    111.79x = 154.18 × 98.69
  4. Step 4: Simplify right side
    111.79x = 15,215.25
  5. Step 5: Solve for x
    x = 15,215.25/111.79
  6. Step 6: Final answer
    x = 136.11

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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.