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Finding the Fourth Proportional to 269.63, 372.11 and 153.21

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Solution

The fourth proportional to 269.63, 372.11 and 153.21 is: 211.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.63 : 372.11 = 153.21 : x
  2. Step 2: Convert to fraction form
    269.63/372.11 = 153.21/x
  3. Step 3: Cross multiply
    269.63x = 372.11 × 153.21
  4. Step 4: Simplify right side
    269.63x = 57,010.97
  5. Step 5: Solve for x
    x = 57,010.97/269.63
  6. Step 6: Final answer
    x = 211.44

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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.