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Finding the Fourth Proportional to 171.95, 257.88 and 80.60

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Solution

The fourth proportional to 171.95, 257.88 and 80.60 is: 120.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.95 : 257.88 = 80.60 : x
  2. Step 2: Convert to fraction form
    171.95/257.88 = 80.60/x
  3. Step 3: Cross multiply
    171.95x = 257.88 × 80.60
  4. Step 4: Simplify right side
    171.95x = 20,785.13
  5. Step 5: Solve for x
    x = 20,785.13/171.95
  6. Step 6: Final answer
    x = 120.88

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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.