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Finding the Third Proportional to 291.75 and 631.31

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Solution

The third proportional to 291.75 and 631.31 is: 1,366.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.75 : 631.31 = 631.31 : x
  2. Step 2: Convert to fraction form
    291.75/631.31 = 631.31/x
  3. Step 3: Cross multiply
    291.75x = 631.31 × 631.31
  4. Step 4: Simplify right side
    291.75x = 398,555.47
  5. Step 5: Solve for x
    x = 398,555.47/291.75
  6. Step 6: Final answer
    x = 1,366.09

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.