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Finding the Third Proportional to 39 and 76.13

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Solution

The third proportional to 39 and 76.13 is: 148.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    39 : 76.13 = 76.13 : x
  2. Step 2: Convert to fraction form
    39/76.13 = 76.13/x
  3. Step 3: Cross multiply
    39x = 76.13 × 76.13
  4. Step 4: Simplify right side
    39x = 5,795.02
  5. Step 5: Solve for x
    x = 5,795.02/39
  6. Step 6: Final answer
    x = 148.59

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Why These Related Problems?

These problems maintain the same ratio (1.95) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.