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Finding the Fourth Proportional to 115.79, 173.30 and 74.69

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Solution

The fourth proportional to 115.79, 173.30 and 74.69 is: 111.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.79 : 173.30 = 74.69 : x
  2. Step 2: Convert to fraction form
    115.79/173.30 = 74.69/x
  3. Step 3: Cross multiply
    115.79x = 173.30 × 74.69
  4. Step 4: Simplify right side
    115.79x = 12,942.54
  5. Step 5: Solve for x
    x = 12,942.54/115.79
  6. Step 6: Final answer
    x = 111.78

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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.