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Finding the Third Proportional to 388.38 and 809.75

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Solution

The third proportional to 388.38 and 809.75 is: 1,688.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.38 : 809.75 = 809.75 : x
  2. Step 2: Convert to fraction form
    388.38/809.75 = 809.75/x
  3. Step 3: Cross multiply
    388.38x = 809.75 × 809.75
  4. Step 4: Simplify right side
    388.38x = 655,695.06
  5. Step 5: Solve for x
    x = 655,695.06/388.38
  6. Step 6: Final answer
    x = 1,688.30

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.