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Finding the Third Proportional to 4.78 and 7.31

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Solution

The third proportional to 4.78 and 7.31 is: 11.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.78 : 7.31 = 7.31 : x
  2. Step 2: Convert to fraction form
    4.78/7.31 = 7.31/x
  3. Step 3: Cross multiply
    4.78x = 7.31 × 7.31
  4. Step 4: Simplify right side
    4.78x = 53.47
  5. Step 5: Solve for x
    x = 53.47/4.78
  6. Step 6: Final answer
    x = 11.18

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.