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Finding the Fourth Proportional to 111.08, 153.21 and 66.82

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Solution

The fourth proportional to 111.08, 153.21 and 66.82 is: 92.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.08 : 153.21 = 66.82 : x
  2. Step 2: Convert to fraction form
    111.08/153.21 = 66.82/x
  3. Step 3: Cross multiply
    111.08x = 153.21 × 66.82
  4. Step 4: Simplify right side
    111.08x = 10,237.68
  5. Step 5: Solve for x
    x = 10,237.68/111.08
  6. Step 6: Final answer
    x = 92.16

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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.