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Finding the Fourth Proportional to 171.43, 256.87 and 68.59

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Solution

The fourth proportional to 171.43, 256.87 and 68.59 is: 102.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.43 : 256.87 = 68.59 : x
  2. Step 2: Convert to fraction form
    171.43/256.87 = 68.59/x
  3. Step 3: Cross multiply
    171.43x = 256.87 × 68.59
  4. Step 4: Simplify right side
    171.43x = 17,618.71
  5. Step 5: Solve for x
    x = 17,618.71/171.43
  6. Step 6: Final answer
    x = 102.77

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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.