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Finding the Third Proportional to 688.88 and 864.19

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Solution

The third proportional to 688.88 and 864.19 is: 1,084.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.88 : 864.19 = 864.19 : x
  2. Step 2: Convert to fraction form
    688.88/864.19 = 864.19/x
  3. Step 3: Cross multiply
    688.88x = 864.19 × 864.19
  4. Step 4: Simplify right side
    688.88x = 746,820.04
  5. Step 5: Solve for x
    x = 746,820.04/688.88
  6. Step 6: Final answer
    x = 1,084.12

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Why These Related Problems?

These problems maintain the same ratio (1.25) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.