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Finding the Third Proportional to 643.31 and 935.16

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Solution

The third proportional to 643.31 and 935.16 is: 1,359.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.31 : 935.16 = 935.16 : x
  2. Step 2: Convert to fraction form
    643.31/935.16 = 935.16/x
  3. Step 3: Cross multiply
    643.31x = 935.16 × 935.16
  4. Step 4: Simplify right side
    643.31x = 874,517.21
  5. Step 5: Solve for x
    x = 874,517.21/643.31
  6. Step 6: Final answer
    x = 1,359.40

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.