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Finding the Fourth Proportional to 171.51, 257.22 and 80.12

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Solution

The fourth proportional to 171.51, 257.22 and 80.12 is: 120.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.51 : 257.22 = 80.12 : x
  2. Step 2: Convert to fraction form
    171.51/257.22 = 80.12/x
  3. Step 3: Cross multiply
    171.51x = 257.22 × 80.12
  4. Step 4: Simplify right side
    171.51x = 20,608.67
  5. Step 5: Solve for x
    x = 20,608.67/171.51
  6. Step 6: Final answer
    x = 120.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.