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Finding the Third Proportional to 721.13 and 1,235.81

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Solution

The third proportional to 721.13 and 1,235.81 is: 2,117.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.13 : 1,235.81 = 1,235.81 : x
  2. Step 2: Convert to fraction form
    721.13/1,235.81 = 1,235.81/x
  3. Step 3: Cross multiply
    721.13x = 1,235.81 × 1,235.81
  4. Step 4: Simplify right side
    721.13x = 1,527,232.54
  5. Step 5: Solve for x
    x = 1,527,232.54/721.13
  6. Step 6: Final answer
    x = 2,117.85

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Why These Related Problems?

These problems maintain the same ratio (1.71) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.