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Finding the Third Proportional to 1,387.97 and 2,087.44

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Solution

The third proportional to 1,387.97 and 2,087.44 is: 3,139.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.97 : 2,087.44 = 2,087.44 : x
  2. Step 2: Convert to fraction form
    1,387.97/2,087.44 = 2,087.44/x
  3. Step 3: Cross multiply
    1,387.97x = 2,087.44 × 2,087.44
  4. Step 4: Simplify right side
    1,387.97x = 4,357,395.32
  5. Step 5: Solve for x
    x = 4,357,395.32/1,387.97
  6. Step 6: Final answer
    x = 3,139.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.