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Finding the Fourth Proportional to 115.74, 173.64 and 113.79

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Solution

The fourth proportional to 115.74, 173.64 and 113.79 is: 170.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.74 : 173.64 = 113.79 : x
  2. Step 2: Convert to fraction form
    115.74/173.64 = 113.79/x
  3. Step 3: Cross multiply
    115.74x = 173.64 × 113.79
  4. Step 4: Simplify right side
    115.74x = 19,758.50
  5. Step 5: Solve for x
    x = 19,758.50/115.74
  6. Step 6: Final answer
    x = 170.71

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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.