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Finding the Third Proportional to 138.69 and 245.88

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Solution

The third proportional to 138.69 and 245.88 is: 435.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.69 : 245.88 = 245.88 : x
  2. Step 2: Convert to fraction form
    138.69/245.88 = 245.88/x
  3. Step 3: Cross multiply
    138.69x = 245.88 × 245.88
  4. Step 4: Simplify right side
    138.69x = 60,454.52
  5. Step 5: Solve for x
    x = 60,454.52/138.69
  6. Step 6: Final answer
    x = 435.90

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Why These Related Problems?

These problems maintain the same ratio (1.77) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.