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Finding the Third Proportional to 139.50 and 261.75

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Solution

The third proportional to 139.50 and 261.75 is: 491.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.50 : 261.75 = 261.75 : x
  2. Step 2: Convert to fraction form
    139.50/261.75 = 261.75/x
  3. Step 3: Cross multiply
    139.50x = 261.75 × 261.75
  4. Step 4: Simplify right side
    139.50x = 68,513.06
  5. Step 5: Solve for x
    x = 68,513.06/139.50
  6. Step 6: Final answer
    x = 491.13

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Find third proportional to 69.75 and 130.88
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Why These Related Problems?

These problems maintain the same ratio (1.88) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.