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Finding the Fourth Proportional to 110.67, 166.07 and 78.09

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Solution

The fourth proportional to 110.67, 166.07 and 78.09 is: 117.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.67 : 166.07 = 78.09 : x
  2. Step 2: Convert to fraction form
    110.67/166.07 = 78.09/x
  3. Step 3: Cross multiply
    110.67x = 166.07 × 78.09
  4. Step 4: Simplify right side
    110.67x = 12,968.02
  5. Step 5: Solve for x
    x = 12,968.02/110.67
  6. Step 6: Final answer
    x = 117.18

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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.