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Finding the Fourth Proportional to 115.20, 173.61 and 112.95

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Solution

The fourth proportional to 115.20, 173.61 and 112.95 is: 170.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.20 : 173.61 = 112.95 : x
  2. Step 2: Convert to fraction form
    115.20/173.61 = 112.95/x
  3. Step 3: Cross multiply
    115.20x = 173.61 × 112.95
  4. Step 4: Simplify right side
    115.20x = 19,609.25
  5. Step 5: Solve for x
    x = 19,609.25/115.20
  6. Step 6: Final answer
    x = 170.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.