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Finding the Fourth Proportional to 171.77, 257.79 and 80.51

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Solution

The fourth proportional to 171.77, 257.79 and 80.51 is: 120.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.77 : 257.79 = 80.51 : x
  2. Step 2: Convert to fraction form
    171.77/257.79 = 80.51/x
  3. Step 3: Cross multiply
    171.77x = 257.79 × 80.51
  4. Step 4: Simplify right side
    171.77x = 20,754.67
  5. Step 5: Solve for x
    x = 20,754.67/171.77
  6. Step 6: Final answer
    x = 120.83

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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.