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Finding the Third Proportional to 7,940 and 20,921

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Solution

The third proportional to 7,940 and 20,921 is: 55,124.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,940 : 20,921 = 20,921 : x
  2. Step 2: Convert to fraction form
    7,940/20,921 = 20,921/x
  3. Step 3: Cross multiply
    7,940x = 20,921 × 20,921
  4. Step 4: Simplify right side
    7,940x = 437,688,241
  5. Step 5: Solve for x
    x = 437,688,241/7,940
  6. Step 6: Final answer
    x = 55,124.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.