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Finding the Fourth Proportional to 80.81, 121.32 and 60.65

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Solution

The fourth proportional to 80.81, 121.32 and 60.65 is: 91.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.81 : 121.32 = 60.65 : x
  2. Step 2: Convert to fraction form
    80.81/121.32 = 60.65/x
  3. Step 3: Cross multiply
    80.81x = 121.32 × 60.65
  4. Step 4: Simplify right side
    80.81x = 7,358.06
  5. Step 5: Solve for x
    x = 7,358.06/80.81
  6. Step 6: Final answer
    x = 91.05

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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.