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Finding the Fourth Proportional to 110.72, 166.01 and 42.21

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Solution

The fourth proportional to 110.72, 166.01 and 42.21 is: 63.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.72 : 166.01 = 42.21 : x
  2. Step 2: Convert to fraction form
    110.72/166.01 = 42.21/x
  3. Step 3: Cross multiply
    110.72x = 166.01 × 42.21
  4. Step 4: Simplify right side
    110.72x = 7,007.07
  5. Step 5: Solve for x
    x = 7,007.07/110.72
  6. Step 6: Final answer
    x = 63.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.