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Finding the Third Proportional to 149.63 and 321.13

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Solution

The third proportional to 149.63 and 321.13 is: 689.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.63 : 321.13 = 321.13 : x
  2. Step 2: Convert to fraction form
    149.63/321.13 = 321.13/x
  3. Step 3: Cross multiply
    149.63x = 321.13 × 321.13
  4. Step 4: Simplify right side
    149.63x = 103,121.27
  5. Step 5: Solve for x
    x = 103,121.27/149.63
  6. Step 6: Final answer
    x = 689.20

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.