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Finding the Third Proportional to 619.84 and 721.88

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Solution

The third proportional to 619.84 and 721.88 is: 840.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.84 : 721.88 = 721.88 : x
  2. Step 2: Convert to fraction form
    619.84/721.88 = 721.88/x
  3. Step 3: Cross multiply
    619.84x = 721.88 × 721.88
  4. Step 4: Simplify right side
    619.84x = 521,111.98
  5. Step 5: Solve for x
    x = 521,111.98/619.84
  6. Step 6: Final answer
    x = 840.72

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Why These Related Problems?

These problems maintain the same ratio (1.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.