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Finding the Third Proportional to 1,980 and 2,988

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Solution

The third proportional to 1,980 and 2,988 is: 4,509.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980 : 2,988 = 2,988 : x
  2. Step 2: Convert to fraction form
    1,980/2,988 = 2,988/x
  3. Step 3: Cross multiply
    1,980x = 2,988 × 2,988
  4. Step 4: Simplify right side
    1,980x = 8,928,144
  5. Step 5: Solve for x
    x = 8,928,144/1,980
  6. Step 6: Final answer
    x = 4,509.16

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.