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Finding the Third Proportional to 726 and 1,578

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Solution

The third proportional to 726 and 1,578 is: 3,429.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    726 : 1,578 = 1,578 : x
  2. Step 2: Convert to fraction form
    726/1,578 = 1,578/x
  3. Step 3: Cross multiply
    726x = 1,578 × 1,578
  4. Step 4: Simplify right side
    726x = 2,490,084
  5. Step 5: Solve for x
    x = 2,490,084/726
  6. Step 6: Final answer
    x = 3,429.87

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.