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Finding the Third Proportional to 128,806.88 and 189,479.25

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Solution

The third proportional to 128,806.88 and 189,479.25 is: 278,730.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,806.88 : 189,479.25 = 189,479.25 : x
  2. Step 2: Convert to fraction form
    128,806.88/189,479.25 = 189,479.25/x
  3. Step 3: Cross multiply
    128,806.88x = 189,479.25 × 189,479.25
  4. Step 4: Simplify right side
    128,806.88x = 35,902,386,180.56
  5. Step 5: Solve for x
    x = 35,902,386,180.56/128,806.88
  6. Step 6: Final answer
    x = 278,730.36

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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.