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Finding the Third Proportional to 361.31 and 618.19

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Solution

The third proportional to 361.31 and 618.19 is: 1,057.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.31 : 618.19 = 618.19 : x
  2. Step 2: Convert to fraction form
    361.31/618.19 = 618.19/x
  3. Step 3: Cross multiply
    361.31x = 618.19 × 618.19
  4. Step 4: Simplify right side
    361.31x = 382,155.79
  5. Step 5: Solve for x
    x = 382,155.79/361.31
  6. Step 6: Final answer
    x = 1,057.69

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Why These Related Problems?

These problems maintain the same ratio (1.71) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.