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Finding the Third Proportional to 439.17 and 684.70

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Solution

The third proportional to 439.17 and 684.70 is: 1,067.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.17 : 684.70 = 684.70 : x
  2. Step 2: Convert to fraction form
    439.17/684.70 = 684.70/x
  3. Step 3: Cross multiply
    439.17x = 684.70 × 684.70
  4. Step 4: Simplify right side
    439.17x = 468,818.37
  5. Step 5: Solve for x
    x = 468,818.37/439.17
  6. Step 6: Final answer
    x = 1,067.51

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.