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Finding the Third Proportional to 279.28 and 430.31

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Solution

The third proportional to 279.28 and 430.31 is: 663.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.28 : 430.31 = 430.31 : x
  2. Step 2: Convert to fraction form
    279.28/430.31 = 430.31/x
  3. Step 3: Cross multiply
    279.28x = 430.31 × 430.31
  4. Step 4: Simplify right side
    279.28x = 185,168.85
  5. Step 5: Solve for x
    x = 185,168.85/279.28
  6. Step 6: Final answer
    x = 663.02

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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.