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Finding the Third Proportional to 815.81 and 1,220.16

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Solution

The third proportional to 815.81 and 1,220.16 is: 1,824.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.81 : 1,220.16 = 1,220.16 : x
  2. Step 2: Convert to fraction form
    815.81/1,220.16 = 1,220.16/x
  3. Step 3: Cross multiply
    815.81x = 1,220.16 × 1,220.16
  4. Step 4: Simplify right side
    815.81x = 1,488,781.27
  5. Step 5: Solve for x
    x = 1,488,781.27/815.81
  6. Step 6: Final answer
    x = 1,824.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.