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Finding the Third Proportional to 390.66 and 833.63

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Solution

The third proportional to 390.66 and 833.63 is: 1,778.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.66 : 833.63 = 833.63 : x
  2. Step 2: Convert to fraction form
    390.66/833.63 = 833.63/x
  3. Step 3: Cross multiply
    390.66x = 833.63 × 833.63
  4. Step 4: Simplify right side
    390.66x = 694,930.64
  5. Step 5: Solve for x
    x = 694,930.64/390.66
  6. Step 6: Final answer
    x = 1,778.88

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.