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Finding the Third Proportional to 393.56 and 854.81

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Solution

The third proportional to 393.56 and 854.81 is: 1,856.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.56 : 854.81 = 854.81 : x
  2. Step 2: Convert to fraction form
    393.56/854.81 = 854.81/x
  3. Step 3: Cross multiply
    393.56x = 854.81 × 854.81
  4. Step 4: Simplify right side
    393.56x = 730,704.41
  5. Step 5: Solve for x
    x = 730,704.41/393.56
  6. Step 6: Final answer
    x = 1,856.64

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.