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Finding the Fourth Proportional to 247.92, 371.56 and 138.23

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Solution

The fourth proportional to 247.92, 371.56 and 138.23 is: 207.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.92 : 371.56 = 138.23 : x
  2. Step 2: Convert to fraction form
    247.92/371.56 = 138.23/x
  3. Step 3: Cross multiply
    247.92x = 371.56 × 138.23
  4. Step 4: Simplify right side
    247.92x = 51,361.88
  5. Step 5: Solve for x
    x = 51,361.88/247.92
  6. Step 6: Final answer
    x = 207.17

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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.