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Finding the Third Proportional to 279.75 and 631.88

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Solution

The third proportional to 279.75 and 631.88 is: 1,427.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.75 : 631.88 = 631.88 : x
  2. Step 2: Convert to fraction form
    279.75/631.88 = 631.88/x
  3. Step 3: Cross multiply
    279.75x = 631.88 × 631.88
  4. Step 4: Simplify right side
    279.75x = 399,266.02
  5. Step 5: Solve for x
    x = 399,266.02/279.75
  6. Step 6: Final answer
    x = 1,427.22

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Why These Related Problems?

These problems maintain the same ratio (2.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.