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Finding the Third Proportional to 1,387.50 and 2,979

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Solution

The third proportional to 1,387.50 and 2,979 is: 6,395.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.50 : 2,979 = 2,979 : x
  2. Step 2: Convert to fraction form
    1,387.50/2,979 = 2,979/x
  3. Step 3: Cross multiply
    1,387.50x = 2,979 × 2,979
  4. Step 4: Simplify right side
    1,387.50x = 8,874,441
  5. Step 5: Solve for x
    x = 8,874,441/1,387.50
  6. Step 6: Final answer
    x = 6,395.99

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.