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Finding the Third Proportional to 721.13 and 779.06

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Solution

The third proportional to 721.13 and 779.06 is: 841.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.13 : 779.06 = 779.06 : x
  2. Step 2: Convert to fraction form
    721.13/779.06 = 779.06/x
  3. Step 3: Cross multiply
    721.13x = 779.06 × 779.06
  4. Step 4: Simplify right side
    721.13x = 606,938.38
  5. Step 5: Solve for x
    x = 606,938.38/721.13
  6. Step 6: Final answer
    x = 841.65

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.