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Finding the Third Proportional to 2.40 and 3.90

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Solution

The third proportional to 2.40 and 3.90 is: 6.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.40 : 3.90 = 3.90 : x
  2. Step 2: Convert to fraction form
    2.40/3.90 = 3.90/x
  3. Step 3: Cross multiply
    2.40x = 3.90 × 3.90
  4. Step 4: Simplify right side
    2.40x = 15.24
  5. Step 5: Solve for x
    x = 15.24/2.40
  6. Step 6: Final answer
    x = 6.34

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.