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Finding the Third Proportional to 643 and 931

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Solution

The third proportional to 643 and 931 is: 1,348.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    643 : 931 = 931 : x
  2. Step 2: Convert to fraction form
    643/931 = 931/x
  3. Step 3: Cross multiply
    643x = 931 × 931
  4. Step 4: Simplify right side
    643x = 866,761
  5. Step 5: Solve for x
    x = 866,761/643
  6. Step 6: Final answer
    x = 1,348.00

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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.