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Finding the Fourth Proportional to 80.68, 121.13 and 50.31

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Solution

The fourth proportional to 80.68, 121.13 and 50.31 is: 75.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.68 : 121.13 = 50.31 : x
  2. Step 2: Convert to fraction form
    80.68/121.13 = 50.31/x
  3. Step 3: Cross multiply
    80.68x = 121.13 × 50.31
  4. Step 4: Simplify right side
    80.68x = 6,094.05
  5. Step 5: Solve for x
    x = 6,094.05/80.68
  6. Step 6: Final answer
    x = 75.53

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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.