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Finding the Third Proportional to 39.09 and 64.88

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Solution

The third proportional to 39.09 and 64.88 is: 107.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.09 : 64.88 = 64.88 : x
  2. Step 2: Convert to fraction form
    39.09/64.88 = 64.88/x
  3. Step 3: Cross multiply
    39.09x = 64.88 × 64.88
  4. Step 4: Simplify right side
    39.09x = 4,208.77
  5. Step 5: Solve for x
    x = 4,208.77/39.09
  6. Step 6: Final answer
    x = 107.66

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.