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Finding the Third Proportional to 4.79 and 12.31

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Solution

The third proportional to 4.79 and 12.31 is: 31.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.79 : 12.31 = 12.31 : x
  2. Step 2: Convert to fraction form
    4.79/12.31 = 12.31/x
  3. Step 3: Cross multiply
    4.79x = 12.31 × 12.31
  4. Step 4: Simplify right side
    4.79x = 151.46
  5. Step 5: Solve for x
    x = 151.46/4.79
  6. Step 6: Final answer
    x = 31.61

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Why These Related Problems?

These problems maintain the same ratio (2.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.