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Finding the Fourth Proportional to 12.49, 18.72 and 6.80

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Solution

The fourth proportional to 12.49, 18.72 and 6.80 is: 10.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.49 : 18.72 = 6.80 : x
  2. Step 2: Convert to fraction form
    12.49/18.72 = 6.80/x
  3. Step 3: Cross multiply
    12.49x = 18.72 × 6.80
  4. Step 4: Simplify right side
    12.49x = 127.20
  5. Step 5: Solve for x
    x = 127.20/12.49
  6. Step 6: Final answer
    x = 10.19

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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.