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Finding the Fourth Proportional to 110.85, 166.09 and 78.30

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Solution

The fourth proportional to 110.85, 166.09 and 78.30 is: 117.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.85 : 166.09 = 78.30 : x
  2. Step 2: Convert to fraction form
    110.85/166.09 = 78.30/x
  3. Step 3: Cross multiply
    110.85x = 166.09 × 78.30
  4. Step 4: Simplify right side
    110.85x = 13,004.18
  5. Step 5: Solve for x
    x = 13,004.18/110.85
  6. Step 6: Final answer
    x = 117.31

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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.