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Finding the Fourth Proportional to 12.49, 18.74 and 7.42

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Solution

The fourth proportional to 12.49, 18.74 and 7.42 is: 11.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.49 : 18.74 = 7.42 : x
  2. Step 2: Convert to fraction form
    12.49/18.74 = 7.42/x
  3. Step 3: Cross multiply
    12.49x = 18.74 × 7.42
  4. Step 4: Simplify right side
    12.49x = 139.05
  5. Step 5: Solve for x
    x = 139.05/12.49
  6. Step 6: Final answer
    x = 11.13

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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.