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Finding the Third Proportional to 128,875 and 279,890

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Solution

The third proportional to 128,875 and 279,890 is: 607,863.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,875 : 279,890 = 279,890 : x
  2. Step 2: Convert to fraction form
    128,875/279,890 = 279,890/x
  3. Step 3: Cross multiply
    128,875x = 279,890 × 279,890
  4. Step 4: Simplify right side
    128,875x = 78,338,412,100
  5. Step 5: Solve for x
    x = 78,338,412,100/128,875
  6. Step 6: Final answer
    x = 607,863.53

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.