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Finding the Fourth Proportional to 107.71, 161.49 and 80.30

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Solution

The fourth proportional to 107.71, 161.49 and 80.30 is: 120.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.71 : 161.49 = 80.30 : x
  2. Step 2: Convert to fraction form
    107.71/161.49 = 80.30/x
  3. Step 3: Cross multiply
    107.71x = 161.49 × 80.30
  4. Step 4: Simplify right side
    107.71x = 12,967.65
  5. Step 5: Solve for x
    x = 12,967.65/107.71
  6. Step 6: Final answer
    x = 120.39

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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.