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Finding the Third Proportional to 3.09 and 4.78

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Solution

The third proportional to 3.09 and 4.78 is: 7.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.09 : 4.78 = 4.78 : x
  2. Step 2: Convert to fraction form
    3.09/4.78 = 4.78/x
  3. Step 3: Cross multiply
    3.09x = 4.78 × 4.78
  4. Step 4: Simplify right side
    3.09x = 22.86
  5. Step 5: Solve for x
    x = 22.86/3.09
  6. Step 6: Final answer
    x = 7.39

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.