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Finding the Third Proportional to 39 and 74.25

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Solution

The third proportional to 39 and 74.25 is: 141.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    39 : 74.25 = 74.25 : x
  2. Step 2: Convert to fraction form
    39/74.25 = 74.25/x
  3. Step 3: Cross multiply
    39x = 74.25 × 74.25
  4. Step 4: Simplify right side
    39x = 5,513.06
  5. Step 5: Solve for x
    x = 5,513.06/39
  6. Step 6: Final answer
    x = 141.36

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Why These Related Problems?

These problems maintain the same ratio (1.90) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.