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Finding the Third Proportional to 129.50 and 320.50

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Solution

The third proportional to 129.50 and 320.50 is: 793.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.50 : 320.50 = 320.50 : x
  2. Step 2: Convert to fraction form
    129.50/320.50 = 320.50/x
  3. Step 3: Cross multiply
    129.50x = 320.50 × 320.50
  4. Step 4: Simplify right side
    129.50x = 102,720.25
  5. Step 5: Solve for x
    x = 102,720.25/129.50
  6. Step 6: Final answer
    x = 793.21

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Why These Related Problems?

These problems maintain the same ratio (2.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.