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Finding the Third Proportional to 643.88 and 920.44

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Solution

The third proportional to 643.88 and 920.44 is: 1,315.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.88 : 920.44 = 920.44 : x
  2. Step 2: Convert to fraction form
    643.88/920.44 = 920.44/x
  3. Step 3: Cross multiply
    643.88x = 920.44 × 920.44
  4. Step 4: Simplify right side
    643.88x = 847,205.19
  5. Step 5: Solve for x
    x = 847,205.19/643.88
  6. Step 6: Final answer
    x = 1,315.79

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.