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Finding the Third Proportional to 128,837.25 and 189,402.75

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Solution

The third proportional to 128,837.25 and 189,402.75 is: 278,439.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,837.25 : 189,402.75 = 189,402.75 : x
  2. Step 2: Convert to fraction form
    128,837.25/189,402.75 = 189,402.75/x
  3. Step 3: Cross multiply
    128,837.25x = 189,402.75 × 189,402.75
  4. Step 4: Simplify right side
    128,837.25x = 35,873,401,707.56
  5. Step 5: Solve for x
    x = 35,873,401,707.56/128,837.25
  6. Step 6: Final answer
    x = 278,439.67

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.