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Finding the Fourth Proportional to 269.72, 372.17 and 153.28

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Solution

The fourth proportional to 269.72, 372.17 and 153.28 is: 211.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.72 : 372.17 = 153.28 : x
  2. Step 2: Convert to fraction form
    269.72/372.17 = 153.28/x
  3. Step 3: Cross multiply
    269.72x = 372.17 × 153.28
  4. Step 4: Simplify right side
    269.72x = 57,046.22
  5. Step 5: Solve for x
    x = 57,046.22/269.72
  6. Step 6: Final answer
    x = 211.50

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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.