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Finding the Fourth Proportional to 120.80, 181.17 and 69.37

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Solution

The fourth proportional to 120.80, 181.17 and 69.37 is: 104.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.80 : 181.17 = 69.37 : x
  2. Step 2: Convert to fraction form
    120.80/181.17 = 69.37/x
  3. Step 3: Cross multiply
    120.80x = 181.17 × 69.37
  4. Step 4: Simplify right side
    120.80x = 12,567.31
  5. Step 5: Solve for x
    x = 12,567.31/120.80
  6. Step 6: Final answer
    x = 104.03

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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.