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Finding the Third Proportional to 1,272.94 and 1,689.47

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Solution

The third proportional to 1,272.94 and 1,689.47 is: 2,242.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.94 : 1,689.47 = 1,689.47 : x
  2. Step 2: Convert to fraction form
    1,272.94/1,689.47 = 1,689.47/x
  3. Step 3: Cross multiply
    1,272.94x = 1,689.47 × 1,689.47
  4. Step 4: Simplify right side
    1,272.94x = 2,854,304.66
  5. Step 5: Solve for x
    x = 2,854,304.66/1,272.94
  6. Step 6: Final answer
    x = 2,242.30

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.