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Finding the Third Proportional to 309.94 and 631.13

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Solution

The third proportional to 309.94 and 631.13 is: 1,285.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.94 : 631.13 = 631.13 : x
  2. Step 2: Convert to fraction form
    309.94/631.13 = 631.13/x
  3. Step 3: Cross multiply
    309.94x = 631.13 × 631.13
  4. Step 4: Simplify right side
    309.94x = 398,318.77
  5. Step 5: Solve for x
    x = 398,318.77/309.94
  6. Step 6: Final answer
    x = 1,285.16

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Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.