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Finding the Third Proportional to 25.31 and 39.38

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Solution

The third proportional to 25.31 and 39.38 is: 61.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.31 : 39.38 = 39.38 : x
  2. Step 2: Convert to fraction form
    25.31/39.38 = 39.38/x
  3. Step 3: Cross multiply
    25.31x = 39.38 × 39.38
  4. Step 4: Simplify right side
    25.31x = 1,550.39
  5. Step 5: Solve for x
    x = 1,550.39/25.31
  6. Step 6: Final answer
    x = 61.25

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.