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Finding the Third Proportional to 312.05 and 553.22

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Solution

The third proportional to 312.05 and 553.22 is: 980.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.05 : 553.22 = 553.22 : x
  2. Step 2: Convert to fraction form
    312.05/553.22 = 553.22/x
  3. Step 3: Cross multiply
    312.05x = 553.22 × 553.22
  4. Step 4: Simplify right side
    312.05x = 306,050.99
  5. Step 5: Solve for x
    x = 306,050.99/312.05
  6. Step 6: Final answer
    x = 980.79

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Why These Related Problems?

These problems maintain the same ratio (1.77) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.