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Finding the Third Proportional to 2.85 and 7.40

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Solution

The third proportional to 2.85 and 7.40 is: 19.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.85 : 7.40 = 7.40 : x
  2. Step 2: Convert to fraction form
    2.85/7.40 = 7.40/x
  3. Step 3: Cross multiply
    2.85x = 7.40 × 7.40
  4. Step 4: Simplify right side
    2.85x = 54.80
  5. Step 5: Solve for x
    x = 54.80/2.85
  6. Step 6: Final answer
    x = 19.23

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Why These Related Problems?

These problems maintain the same ratio (2.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.