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Finding the Third Proportional to 139.25 and 252.50

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Solution

The third proportional to 139.25 and 252.50 is: 457.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.25 : 252.50 = 252.50 : x
  2. Step 2: Convert to fraction form
    139.25/252.50 = 252.50/x
  3. Step 3: Cross multiply
    139.25x = 252.50 × 252.50
  4. Step 4: Simplify right side
    139.25x = 63,756.25
  5. Step 5: Solve for x
    x = 63,756.25/139.25
  6. Step 6: Final answer
    x = 457.85

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Why These Related Problems?

These problems maintain the same ratio (1.81) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.