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Finding the Third Proportional to 81,663.75 and 128,328.75

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Solution

The third proportional to 81,663.75 and 128,328.75 is: 201,659.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,663.75 : 128,328.75 = 128,328.75 : x
  2. Step 2: Convert to fraction form
    81,663.75/128,328.75 = 128,328.75/x
  3. Step 3: Cross multiply
    81,663.75x = 128,328.75 × 128,328.75
  4. Step 4: Simplify right side
    81,663.75x = 16,468,268,076.56
  5. Step 5: Solve for x
    x = 16,468,268,076.56/81,663.75
  6. Step 6: Final answer
    x = 201,659.46

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.