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Finding the Fourth Proportional to 247.85, 371.09 and 186.80

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Solution

The fourth proportional to 247.85, 371.09 and 186.80 is: 279.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.85 : 371.09 = 186.80 : x
  2. Step 2: Convert to fraction form
    247.85/371.09 = 186.80/x
  3. Step 3: Cross multiply
    247.85x = 371.09 × 186.80
  4. Step 4: Simplify right side
    247.85x = 69,319.62
  5. Step 5: Solve for x
    x = 69,319.62/247.85
  6. Step 6: Final answer
    x = 279.68

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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.