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Finding the Fourth Proportional to 80.93, 111.49 and 74.79

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Solution

The fourth proportional to 80.93, 111.49 and 74.79 is: 103.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.93 : 111.49 = 74.79 : x
  2. Step 2: Convert to fraction form
    80.93/111.49 = 74.79/x
  3. Step 3: Cross multiply
    80.93x = 111.49 × 74.79
  4. Step 4: Simplify right side
    80.93x = 8,338.15
  5. Step 5: Solve for x
    x = 8,338.15/80.93
  6. Step 6: Final answer
    x = 103.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.