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Finding the Fourth Proportional to 171.07, 236.13 and 121.87

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Solution

The fourth proportional to 171.07, 236.13 and 121.87 is: 168.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.07 : 236.13 = 121.87 : x
  2. Step 2: Convert to fraction form
    171.07/236.13 = 121.87/x
  3. Step 3: Cross multiply
    171.07x = 236.13 × 121.87
  4. Step 4: Simplify right side
    171.07x = 28,777.16
  5. Step 5: Solve for x
    x = 28,777.16/171.07
  6. Step 6: Final answer
    x = 168.22

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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.