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Finding the Third Proportional to 351.56 and 511.78

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Solution

The third proportional to 351.56 and 511.78 is: 745.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.56 : 511.78 = 511.78 : x
  2. Step 2: Convert to fraction form
    351.56/511.78 = 511.78/x
  3. Step 3: Cross multiply
    351.56x = 511.78 × 511.78
  4. Step 4: Simplify right side
    351.56x = 261,920.05
  5. Step 5: Solve for x
    x = 261,920.05/351.56
  6. Step 6: Final answer
    x = 745.02

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.