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Finding the Fourth Proportional to 194.80, 268.81 and 111.91

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Solution

The fourth proportional to 194.80, 268.81 and 111.91 is: 154.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.80 : 268.81 = 111.91 : x
  2. Step 2: Convert to fraction form
    194.80/268.81 = 111.91/x
  3. Step 3: Cross multiply
    194.80x = 268.81 × 111.91
  4. Step 4: Simplify right side
    194.80x = 30,082.53
  5. Step 5: Solve for x
    x = 30,082.53/194.80
  6. Step 6: Final answer
    x = 154.43

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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.