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Finding the Fourth Proportional to 247.69, 371.69 and 139.56

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Solution

The fourth proportional to 247.69, 371.69 and 139.56 is: 209.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.69 : 371.69 = 139.56 : x
  2. Step 2: Convert to fraction form
    247.69/371.69 = 139.56/x
  3. Step 3: Cross multiply
    247.69x = 371.69 × 139.56
  4. Step 4: Simplify right side
    247.69x = 51,871.49
  5. Step 5: Solve for x
    x = 51,871.49/247.69
  6. Step 6: Final answer
    x = 209.42

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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.