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Finding the Third Proportional to 390.84 and 864.26

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Solution

The third proportional to 390.84 and 864.26 is: 1,911.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.84 : 864.26 = 864.26 : x
  2. Step 2: Convert to fraction form
    390.84/864.26 = 864.26/x
  3. Step 3: Cross multiply
    390.84x = 864.26 × 864.26
  4. Step 4: Simplify right side
    390.84x = 746,951.69
  5. Step 5: Solve for x
    x = 746,951.69/390.84
  6. Step 6: Final answer
    x = 1,911.14

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.