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Finding the Fourth Proportional to 171.13, 256.66 and 79.87

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Solution

The fourth proportional to 171.13, 256.66 and 79.87 is: 119.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.13 : 256.66 = 79.87 : x
  2. Step 2: Convert to fraction form
    171.13/256.66 = 79.87/x
  3. Step 3: Cross multiply
    171.13x = 256.66 × 79.87
  4. Step 4: Simplify right side
    171.13x = 20,498.59
  5. Step 5: Solve for x
    x = 20,498.59/171.13
  6. Step 6: Final answer
    x = 119.79

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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.