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Finding the Third Proportional to 39 and 64.31

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Solution

The third proportional to 39 and 64.31 is: 106.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    39 : 64.31 = 64.31 : x
  2. Step 2: Convert to fraction form
    39/64.31 = 64.31/x
  3. Step 3: Cross multiply
    39x = 64.31 × 64.31
  4. Step 4: Simplify right side
    39x = 4,136.10
  5. Step 5: Solve for x
    x = 4,136.10/39
  6. Step 6: Final answer
    x = 106.05

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.