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Finding the Third Proportional to 687 and 1,065

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Solution

The third proportional to 687 and 1,065 is: 1,650.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    687 : 1,065 = 1,065 : x
  2. Step 2: Convert to fraction form
    687/1,065 = 1,065/x
  3. Step 3: Cross multiply
    687x = 1,065 × 1,065
  4. Step 4: Simplify right side
    687x = 1,134,225
  5. Step 5: Solve for x
    x = 1,134,225/687
  6. Step 6: Final answer
    x = 1,650.98

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.