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Finding the Third Proportional to 7,780 and 16,940

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Solution

The third proportional to 7,780 and 16,940 is: 36,884.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,780 : 16,940 = 16,940 : x
  2. Step 2: Convert to fraction form
    7,780/16,940 = 16,940/x
  3. Step 3: Cross multiply
    7,780x = 16,940 × 16,940
  4. Step 4: Simplify right side
    7,780x = 286,963,600
  5. Step 5: Solve for x
    x = 286,963,600/7,780
  6. Step 6: Final answer
    x = 36,884.78

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.