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Finding the Third Proportional to 128,736 and 169,680

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Solution

The third proportional to 128,736 and 169,680 is: 223,646.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,736 : 169,680 = 169,680 : x
  2. Step 2: Convert to fraction form
    128,736/169,680 = 169,680/x
  3. Step 3: Cross multiply
    128,736x = 169,680 × 169,680
  4. Step 4: Simplify right side
    128,736x = 28,791,302,400
  5. Step 5: Solve for x
    x = 28,791,302,400/128,736
  6. Step 6: Final answer
    x = 223,646.09

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.