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Finding the Third Proportional to 385.31 and 830.81

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Solution

The third proportional to 385.31 and 830.81 is: 1,791.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.31 : 830.81 = 830.81 : x
  2. Step 2: Convert to fraction form
    385.31/830.81 = 830.81/x
  3. Step 3: Cross multiply
    385.31x = 830.81 × 830.81
  4. Step 4: Simplify right side
    385.31x = 690,249.41
  5. Step 5: Solve for x
    x = 690,249.41/385.31
  6. Step 6: Final answer
    x = 1,791.40

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.