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Finding the Third Proportional to 1,728 and 2,715.75

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Solution

The third proportional to 1,728 and 2,715.75 is: 4,268.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728 : 2,715.75 = 2,715.75 : x
  2. Step 2: Convert to fraction form
    1,728/2,715.75 = 2,715.75/x
  3. Step 3: Cross multiply
    1,728x = 2,715.75 × 2,715.75
  4. Step 4: Simplify right side
    1,728x = 7,375,298.06
  5. Step 5: Solve for x
    x = 7,375,298.06/1,728
  6. Step 6: Final answer
    x = 4,268.11

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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.