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Finding the Fourth Proportional to 110.89, 166.54 and 72.42

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Solution

The fourth proportional to 110.89, 166.54 and 72.42 is: 108.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.89 : 166.54 = 72.42 : x
  2. Step 2: Convert to fraction form
    110.89/166.54 = 72.42/x
  3. Step 3: Cross multiply
    110.89x = 166.54 × 72.42
  4. Step 4: Simplify right side
    110.89x = 12,060.83
  5. Step 5: Solve for x
    x = 12,060.83/110.89
  6. Step 6: Final answer
    x = 108.76

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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.