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Finding the Third Proportional to 4.50 and 6.40

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Solution

The third proportional to 4.50 and 6.40 is: 9.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.50 : 6.40 = 6.40 : x
  2. Step 2: Convert to fraction form
    4.50/6.40 = 6.40/x
  3. Step 3: Cross multiply
    4.50x = 6.40 × 6.40
  4. Step 4: Simplify right side
    4.50x = 40.94
  5. Step 5: Solve for x
    x = 40.94/4.50
  6. Step 6: Final answer
    x = 9.10

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.