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Finding the Fourth Proportional to 111.14, 153.39 and 66.89

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Solution

The fourth proportional to 111.14, 153.39 and 66.89 is: 92.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.14 : 153.39 = 66.89 : x
  2. Step 2: Convert to fraction form
    111.14/153.39 = 66.89/x
  3. Step 3: Cross multiply
    111.14x = 153.39 × 66.89
  4. Step 4: Simplify right side
    111.14x = 10,260.89
  5. Step 5: Solve for x
    x = 10,260.89/111.14
  6. Step 6: Final answer
    x = 92.33

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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.