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Finding the Third Proportional to 253.41 and 391.31

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Solution

The third proportional to 253.41 and 391.31 is: 604.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.41 : 391.31 = 391.31 : x
  2. Step 2: Convert to fraction form
    253.41/391.31 = 391.31/x
  3. Step 3: Cross multiply
    253.41x = 391.31 × 391.31
  4. Step 4: Simplify right side
    253.41x = 153,125.47
  5. Step 5: Solve for x
    x = 153,125.47/253.41
  6. Step 6: Final answer
    x = 604.27

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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.