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Finding the Third Proportional to 250.13 and 391.31

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Solution

The third proportional to 250.13 and 391.31 is: 612.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.13 : 391.31 = 391.31 : x
  2. Step 2: Convert to fraction form
    250.13/391.31 = 391.31/x
  3. Step 3: Cross multiply
    250.13x = 391.31 × 391.31
  4. Step 4: Simplify right side
    250.13x = 153,125.47
  5. Step 5: Solve for x
    x = 153,125.47/250.13
  6. Step 6: Final answer
    x = 612.20

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.