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Finding the Third Proportional to 399.56 and 579.19

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Solution

The third proportional to 399.56 and 579.19 is: 839.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.56 : 579.19 = 579.19 : x
  2. Step 2: Convert to fraction form
    399.56/579.19 = 579.19/x
  3. Step 3: Cross multiply
    399.56x = 579.19 × 579.19
  4. Step 4: Simplify right side
    399.56x = 335,458.16
  5. Step 5: Solve for x
    x = 335,458.16/399.56
  6. Step 6: Final answer
    x = 839.56

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.