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Finding the Fourth Proportional to 247.73, 371.21 and 209.30

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Solution

The fourth proportional to 247.73, 371.21 and 209.30 is: 313.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.73 : 371.21 = 209.30 : x
  2. Step 2: Convert to fraction form
    247.73/371.21 = 209.30/x
  3. Step 3: Cross multiply
    247.73x = 371.21 × 209.30
  4. Step 4: Simplify right side
    247.73x = 77,691.35
  5. Step 5: Solve for x
    x = 77,691.35/247.73
  6. Step 6: Final answer
    x = 313.62

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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.