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Finding the Third Proportional to 680.91 and 985.92

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Solution

The third proportional to 680.91 and 985.92 is: 1,427.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.91 : 985.92 = 985.92 : x
  2. Step 2: Convert to fraction form
    680.91/985.92 = 985.92/x
  3. Step 3: Cross multiply
    680.91x = 985.92 × 985.92
  4. Step 4: Simplify right side
    680.91x = 972,041.94
  5. Step 5: Solve for x
    x = 972,041.94/680.91
  6. Step 6: Final answer
    x = 1,427.57

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.