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Finding the Fourth Proportional to 111.39, 153.78 and 76.44

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Solution

The fourth proportional to 111.39, 153.78 and 76.44 is: 105.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.39 : 153.78 = 76.44 : x
  2. Step 2: Convert to fraction form
    111.39/153.78 = 76.44/x
  3. Step 3: Cross multiply
    111.39x = 153.78 × 76.44
  4. Step 4: Simplify right side
    111.39x = 11,754.94
  5. Step 5: Solve for x
    x = 11,754.94/111.39
  6. Step 6: Final answer
    x = 105.53

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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.