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Finding the Third Proportional to 121,128 and 183,879

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Solution

The third proportional to 121,128 and 183,879 is: 279,138.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,128 : 183,879 = 183,879 : x
  2. Step 2: Convert to fraction form
    121,128/183,879 = 183,879/x
  3. Step 3: Cross multiply
    121,128x = 183,879 × 183,879
  4. Step 4: Simplify right side
    121,128x = 33,811,486,641
  5. Step 5: Solve for x
    x = 33,811,486,641/121,128
  6. Step 6: Final answer
    x = 279,138.49

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.