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Finding the Fourth Proportional to 171.91, 237.09 and 113.68

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Solution

The fourth proportional to 171.91, 237.09 and 113.68 is: 156.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.91 : 237.09 = 113.68 : x
  2. Step 2: Convert to fraction form
    171.91/237.09 = 113.68/x
  3. Step 3: Cross multiply
    171.91x = 237.09 × 113.68
  4. Step 4: Simplify right side
    171.91x = 26,952.39
  5. Step 5: Solve for x
    x = 26,952.39/171.91
  6. Step 6: Final answer
    x = 156.78

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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.