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Finding the Fourth Proportional to 171.71, 236.86 and 112.69

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Solution

The fourth proportional to 171.71, 236.86 and 112.69 is: 155.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.71 : 236.86 = 112.69 : x
  2. Step 2: Convert to fraction form
    171.71/236.86 = 112.69/x
  3. Step 3: Cross multiply
    171.71x = 236.86 × 112.69
  4. Step 4: Simplify right side
    171.71x = 26,691.75
  5. Step 5: Solve for x
    x = 26,691.75/171.71
  6. Step 6: Final answer
    x = 155.45

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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.