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Finding the Fourth Proportional to 111.70, 154.20 and 76.92

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Solution

The fourth proportional to 111.70, 154.20 and 76.92 is: 106.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.70 : 154.20 = 76.92 : x
  2. Step 2: Convert to fraction form
    111.70/154.20 = 76.92/x
  3. Step 3: Cross multiply
    111.70x = 154.20 × 76.92
  4. Step 4: Simplify right side
    111.70x = 11,861.06
  5. Step 5: Solve for x
    x = 11,861.06/111.70
  6. Step 6: Final answer
    x = 106.19

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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.