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Finding the Third Proportional to 69 and 138.50

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Solution

The third proportional to 69 and 138.50 is: 278.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    69 : 138.50 = 138.50 : x
  2. Step 2: Convert to fraction form
    69/138.50 = 138.50/x
  3. Step 3: Cross multiply
    69x = 138.50 × 138.50
  4. Step 4: Simplify right side
    69x = 19,182.25
  5. Step 5: Solve for x
    x = 19,182.25/69
  6. Step 6: Final answer
    x = 278.00

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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.