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Finding the Fourth Proportional to 269.88, 372.30 and 211.80

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Solution

The fourth proportional to 269.88, 372.30 and 211.80 is: 292.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.88 : 372.30 = 211.80 : x
  2. Step 2: Convert to fraction form
    269.88/372.30 = 211.80/x
  3. Step 3: Cross multiply
    269.88x = 372.30 × 211.80
  4. Step 4: Simplify right side
    269.88x = 78,853.14
  5. Step 5: Solve for x
    x = 78,853.14/269.88
  6. Step 6: Final answer
    x = 292.18

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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.