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Finding the Fourth Proportional to 80.91, 121.40 and 40.33

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Solution

The fourth proportional to 80.91, 121.40 and 40.33 is: 60.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.91 : 121.40 = 40.33 : x
  2. Step 2: Convert to fraction form
    80.91/121.40 = 40.33/x
  3. Step 3: Cross multiply
    80.91x = 121.40 × 40.33
  4. Step 4: Simplify right side
    80.91x = 4,895.86
  5. Step 5: Solve for x
    x = 4,895.86/80.91
  6. Step 6: Final answer
    x = 60.51

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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.