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Finding the Third Proportional to 259.88 and 399.56

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Solution

The third proportional to 259.88 and 399.56 is: 614.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.88 : 399.56 = 399.56 : x
  2. Step 2: Convert to fraction form
    259.88/399.56 = 399.56/x
  3. Step 3: Cross multiply
    259.88x = 399.56 × 399.56
  4. Step 4: Simplify right side
    259.88x = 159,650.19
  5. Step 5: Solve for x
    x = 159,650.19/259.88
  6. Step 6: Final answer
    x = 614.33

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.