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Finding the Third Proportional to 1,988 and 5,180

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Solution

The third proportional to 1,988 and 5,180 is: 13,497.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988 : 5,180 = 5,180 : x
  2. Step 2: Convert to fraction form
    1,988/5,180 = 5,180/x
  3. Step 3: Cross multiply
    1,988x = 5,180 × 5,180
  4. Step 4: Simplify right side
    1,988x = 26,832,400
  5. Step 5: Solve for x
    x = 26,832,400/1,988
  6. Step 6: Final answer
    x = 13,497.18

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Why These Related Problems?

These problems maintain the same ratio (2.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.