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Finding the Third Proportional to 279.28 and 402.19

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Solution

The third proportional to 279.28 and 402.19 is: 579.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.28 : 402.19 = 402.19 : x
  2. Step 2: Convert to fraction form
    279.28/402.19 = 402.19/x
  3. Step 3: Cross multiply
    279.28x = 402.19 × 402.19
  4. Step 4: Simplify right side
    279.28x = 161,754.79
  5. Step 5: Solve for x
    x = 161,754.79/279.28
  6. Step 6: Final answer
    x = 579.18

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Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.