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Finding the Fourth Proportional to 248.06, 371.81 and 139.92

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Solution

The fourth proportional to 248.06, 371.81 and 139.92 is: 209.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.06 : 371.81 = 139.92 : x
  2. Step 2: Convert to fraction form
    248.06/371.81 = 139.92/x
  3. Step 3: Cross multiply
    248.06x = 371.81 × 139.92
  4. Step 4: Simplify right side
    248.06x = 52,022.96
  5. Step 5: Solve for x
    x = 52,022.96/248.06
  6. Step 6: Final answer
    x = 209.72

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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.