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Finding the Third Proportional to 1,275 and 1,998

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Solution

The third proportional to 1,275 and 1,998 is: 3,130.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275 : 1,998 = 1,998 : x
  2. Step 2: Convert to fraction form
    1,275/1,998 = 1,998/x
  3. Step 3: Cross multiply
    1,275x = 1,998 × 1,998
  4. Step 4: Simplify right side
    1,275x = 3,992,004
  5. Step 5: Solve for x
    x = 3,992,004/1,275
  6. Step 6: Final answer
    x = 3,130.98

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.