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Finding the Fourth Proportional to 107.78, 161.30 and 80.66

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Solution

The fourth proportional to 107.78, 161.30 and 80.66 is: 120.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.78 : 161.30 = 80.66 : x
  2. Step 2: Convert to fraction form
    107.78/161.30 = 80.66/x
  3. Step 3: Cross multiply
    107.78x = 161.30 × 80.66
  4. Step 4: Simplify right side
    107.78x = 13,010.46
  5. Step 5: Solve for x
    x = 13,010.46/107.78
  6. Step 6: Final answer
    x = 120.71

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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.