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Finding the Fourth Proportional to 269.49, 371.70 and 171.21

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Solution

The fourth proportional to 269.49, 371.70 and 171.21 is: 236.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.49 : 371.70 = 171.21 : x
  2. Step 2: Convert to fraction form
    269.49/371.70 = 171.21/x
  3. Step 3: Cross multiply
    269.49x = 371.70 × 171.21
  4. Step 4: Simplify right side
    269.49x = 63,638.76
  5. Step 5: Solve for x
    x = 63,638.76/269.49
  6. Step 6: Final answer
    x = 236.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.