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Finding the Third Proportional to 312.56 and 669.94

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Solution

The third proportional to 312.56 and 669.94 is: 1,435.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.56 : 669.94 = 669.94 : x
  2. Step 2: Convert to fraction form
    312.56/669.94 = 669.94/x
  3. Step 3: Cross multiply
    312.56x = 669.94 × 669.94
  4. Step 4: Simplify right side
    312.56x = 448,816.25
  5. Step 5: Solve for x
    x = 448,816.25/312.56
  6. Step 6: Final answer
    x = 1,435.92

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.