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Finding the Third Proportional to 816.75 and 1,685.81

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Solution

The third proportional to 816.75 and 1,685.81 is: 3,479.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.75 : 1,685.81 = 1,685.81 : x
  2. Step 2: Convert to fraction form
    816.75/1,685.81 = 1,685.81/x
  3. Step 3: Cross multiply
    816.75x = 1,685.81 × 1,685.81
  4. Step 4: Simplify right side
    816.75x = 2,841,963.79
  5. Step 5: Solve for x
    x = 2,841,963.79/816.75
  6. Step 6: Final answer
    x = 3,479.60

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.