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Finding the Fourth Proportional to 171.32, 256.97 and 138.97

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Solution

The fourth proportional to 171.32, 256.97 and 138.97 is: 208.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.32 : 256.97 = 138.97 : x
  2. Step 2: Convert to fraction form
    171.32/256.97 = 138.97/x
  3. Step 3: Cross multiply
    171.32x = 256.97 × 138.97
  4. Step 4: Simplify right side
    171.32x = 35,710.34
  5. Step 5: Solve for x
    x = 35,710.34/171.32
  6. Step 6: Final answer
    x = 208.45

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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.