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Finding the Fourth Proportional to 171.20, 236.07 and 123.90

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Solution

The fourth proportional to 171.20, 236.07 and 123.90 is: 170.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.20 : 236.07 = 123.90 : x
  2. Step 2: Convert to fraction form
    171.20/236.07 = 123.90/x
  3. Step 3: Cross multiply
    171.20x = 236.07 × 123.90
  4. Step 4: Simplify right side
    171.20x = 29,249.07
  5. Step 5: Solve for x
    x = 29,249.07/171.20
  6. Step 6: Final answer
    x = 170.85

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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.