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Finding the Fourth Proportional to 171.57, 236.91 and 113.43

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Solution

The fourth proportional to 171.57, 236.91 and 113.43 is: 156.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.57 : 236.91 = 113.43 : x
  2. Step 2: Convert to fraction form
    171.57/236.91 = 113.43/x
  3. Step 3: Cross multiply
    171.57x = 236.91 × 113.43
  4. Step 4: Simplify right side
    171.57x = 26,872.70
  5. Step 5: Solve for x
    x = 26,872.70/171.57
  6. Step 6: Final answer
    x = 156.63

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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.