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Finding the Fourth Proportional to 111.09, 153.26 and 66.81

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Solution

The fourth proportional to 111.09, 153.26 and 66.81 is: 92.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.09 : 153.26 = 66.81 : x
  2. Step 2: Convert to fraction form
    111.09/153.26 = 66.81/x
  3. Step 3: Cross multiply
    111.09x = 153.26 × 66.81
  4. Step 4: Simplify right side
    111.09x = 10,238.53
  5. Step 5: Solve for x
    x = 10,238.53/111.09
  6. Step 6: Final answer
    x = 92.17

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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.