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Finding the Third Proportional to 687 and 1,323

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Solution

The third proportional to 687 and 1,323 is: 2,547.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    687 : 1,323 = 1,323 : x
  2. Step 2: Convert to fraction form
    687/1,323 = 1,323/x
  3. Step 3: Cross multiply
    687x = 1,323 × 1,323
  4. Step 4: Simplify right side
    687x = 1,750,329
  5. Step 5: Solve for x
    x = 1,750,329/687
  6. Step 6: Final answer
    x = 2,547.79

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Why These Related Problems?

These problems maintain the same ratio (1.93) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.