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Finding the Fourth Proportional to 115, 171.15 and 112.44

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Solution

The fourth proportional to 115, 171.15 and 112.44 is: 167.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    115 : 171.15 = 112.44 : x
  2. Step 2: Convert to fraction form
    115/171.15 = 112.44/x
  3. Step 3: Cross multiply
    115x = 171.15 × 112.44
  4. Step 4: Simplify right side
    115x = 19,242.97
  5. Step 5: Solve for x
    x = 19,242.97/115
  6. Step 6: Final answer
    x = 167.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.