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Finding the Third Proportional to 253.90 and 553.78

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Solution

The third proportional to 253.90 and 553.78 is: 1,207.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.90 : 553.78 = 553.78 : x
  2. Step 2: Convert to fraction form
    253.90/553.78 = 553.78/x
  3. Step 3: Cross multiply
    253.90x = 553.78 × 553.78
  4. Step 4: Simplify right side
    253.90x = 306,673.67
  5. Step 5: Solve for x
    x = 306,673.67/253.90
  6. Step 6: Final answer
    x = 1,207.86

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.