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Finding the Third Proportional to 1,988 and 3,940

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Solution

The third proportional to 1,988 and 3,940 is: 7,808.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988 : 3,940 = 3,940 : x
  2. Step 2: Convert to fraction form
    1,988/3,940 = 3,940/x
  3. Step 3: Cross multiply
    1,988x = 3,940 × 3,940
  4. Step 4: Simplify right side
    1,988x = 15,523,600
  5. Step 5: Solve for x
    x = 15,523,600/1,988
  6. Step 6: Final answer
    x = 7,808.65

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Why These Related Problems?

These problems maintain the same ratio (1.98) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.