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Finding the Third Proportional to 831.50 and 1,749

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Solution

The third proportional to 831.50 and 1,749 is: 3,678.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.50 : 1,749 = 1,749 : x
  2. Step 2: Convert to fraction form
    831.50/1,749 = 1,749/x
  3. Step 3: Cross multiply
    831.50x = 1,749 × 1,749
  4. Step 4: Simplify right side
    831.50x = 3,059,001
  5. Step 5: Solve for x
    x = 3,059,001/831.50
  6. Step 6: Final answer
    x = 3,678.89

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.