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Finding the Fourth Proportional to 257.71, 386.70 and 171.13

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Solution

The fourth proportional to 257.71, 386.70 and 171.13 is: 256.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.71 : 386.70 = 171.13 : x
  2. Step 2: Convert to fraction form
    257.71/386.70 = 171.13/x
  3. Step 3: Cross multiply
    257.71x = 386.70 × 171.13
  4. Step 4: Simplify right side
    257.71x = 66,175.97
  5. Step 5: Solve for x
    x = 66,175.97/257.71
  6. Step 6: Final answer
    x = 256.78

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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.