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Finding the Third Proportional to 641 and 992.50

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Solution

The third proportional to 641 and 992.50 is: 1,536.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    641 : 992.50 = 992.50 : x
  2. Step 2: Convert to fraction form
    641/992.50 = 992.50/x
  3. Step 3: Cross multiply
    641x = 992.50 × 992.50
  4. Step 4: Simplify right side
    641x = 985,056.25
  5. Step 5: Solve for x
    x = 985,056.25/641
  6. Step 6: Final answer
    x = 1,536.75

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.