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Finding the Third Proportional to 138,299.25 and 208,720.50

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Solution

The third proportional to 138,299.25 and 208,720.50 is: 314,999.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,299.25 : 208,720.50 = 208,720.50 : x
  2. Step 2: Convert to fraction form
    138,299.25/208,720.50 = 208,720.50/x
  3. Step 3: Cross multiply
    138,299.25x = 208,720.50 × 208,720.50
  4. Step 4: Simplify right side
    138,299.25x = 43,564,247,120.25
  5. Step 5: Solve for x
    x = 43,564,247,120.25/138,299.25
  6. Step 6: Final answer
    x = 314,999.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.