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Finding the Third Proportional to 39.13 and 78.50

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Solution

The third proportional to 39.13 and 78.50 is: 157.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.13 : 78.50 = 78.50 : x
  2. Step 2: Convert to fraction form
    39.13/78.50 = 78.50/x
  3. Step 3: Cross multiply
    39.13x = 78.50 × 78.50
  4. Step 4: Simplify right side
    39.13x = 6,162.25
  5. Step 5: Solve for x
    x = 6,162.25/39.13
  6. Step 6: Final answer
    x = 157.50

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Why These Related Problems?

These problems maintain the same ratio (2.01) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.