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Finding the Third Proportional to 147.75 and 321.56

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Solution

The third proportional to 147.75 and 321.56 is: 699.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.75 : 321.56 = 321.56 : x
  2. Step 2: Convert to fraction form
    147.75/321.56 = 321.56/x
  3. Step 3: Cross multiply
    147.75x = 321.56 × 321.56
  4. Step 4: Simplify right side
    147.75x = 103,402.44
  5. Step 5: Solve for x
    x = 103,402.44/147.75
  6. Step 6: Final answer
    x = 699.85

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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.