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Finding the Third Proportional to 720.88 and 992.75

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Solution

The third proportional to 720.88 and 992.75 is: 1,367.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.88 : 992.75 = 992.75 : x
  2. Step 2: Convert to fraction form
    720.88/992.75 = 992.75/x
  3. Step 3: Cross multiply
    720.88x = 992.75 × 992.75
  4. Step 4: Simplify right side
    720.88x = 985,552.56
  5. Step 5: Solve for x
    x = 985,552.56/720.88
  6. Step 6: Final answer
    x = 1,367.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.