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Finding the Third Proportional to 688.92 and 1,291.78

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Solution

The third proportional to 688.92 and 1,291.78 is: 2,422.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.92 : 1,291.78 = 1,291.78 : x
  2. Step 2: Convert to fraction form
    688.92/1,291.78 = 1,291.78/x
  3. Step 3: Cross multiply
    688.92x = 1,291.78 × 1,291.78
  4. Step 4: Simplify right side
    688.92x = 1,668,698.80
  5. Step 5: Solve for x
    x = 1,668,698.80/688.92
  6. Step 6: Final answer
    x = 2,422.19

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Why These Related Problems?

These problems maintain the same ratio (1.88) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.