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Finding the Third Proportional to 688.75 and 1,511.75

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Solution

The third proportional to 688.75 and 1,511.75 is: 3,318.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.75 : 1,511.75 = 1,511.75 : x
  2. Step 2: Convert to fraction form
    688.75/1,511.75 = 1,511.75/x
  3. Step 3: Cross multiply
    688.75x = 1,511.75 × 1,511.75
  4. Step 4: Simplify right side
    688.75x = 2,285,388.06
  5. Step 5: Solve for x
    x = 2,285,388.06/688.75
  6. Step 6: Final answer
    x = 3,318.17

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.