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Finding the Third Proportional to 628.88 and 763.88

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Solution

The third proportional to 628.88 and 763.88 is: 927.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.88 : 763.88 = 763.88 : x
  2. Step 2: Convert to fraction form
    628.88/763.88 = 763.88/x
  3. Step 3: Cross multiply
    628.88x = 763.88 × 763.88
  4. Step 4: Simplify right side
    628.88x = 583,505.02
  5. Step 5: Solve for x
    x = 583,505.02/628.88
  6. Step 6: Final answer
    x = 927.86

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.