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Finding the Third Proportional to 643.13 and 986.25

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Solution

The third proportional to 643.13 and 986.25 is: 1,512.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.13 : 986.25 = 986.25 : x
  2. Step 2: Convert to fraction form
    643.13/986.25 = 986.25/x
  3. Step 3: Cross multiply
    643.13x = 986.25 × 986.25
  4. Step 4: Simplify right side
    643.13x = 972,689.06
  5. Step 5: Solve for x
    x = 972,689.06/643.13
  6. Step 6: Final answer
    x = 1,512.44

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.