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Finding the Third Proportional to 402 and 831.25

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Solution

The third proportional to 402 and 831.25 is: 1,718.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    402 : 831.25 = 831.25 : x
  2. Step 2: Convert to fraction form
    402/831.25 = 831.25/x
  3. Step 3: Cross multiply
    402x = 831.25 × 831.25
  4. Step 4: Simplify right side
    402x = 690,976.56
  5. Step 5: Solve for x
    x = 690,976.56/402
  6. Step 6: Final answer
    x = 1,718.85

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.