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Finding the Third Proportional to 643.50 and 846

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Solution

The third proportional to 643.50 and 846 is: 1,112.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.50 : 846 = 846 : x
  2. Step 2: Convert to fraction form
    643.50/846 = 846/x
  3. Step 3: Cross multiply
    643.50x = 846 × 846
  4. Step 4: Simplify right side
    643.50x = 715,716
  5. Step 5: Solve for x
    x = 715,716/643.50
  6. Step 6: Final answer
    x = 1,112.22

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.