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Finding the Third Proportional to 809 and 1,213.50

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Solution

The third proportional to 809 and 1,213.50 is: 1,820.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    809 : 1,213.50 = 1,213.50 : x
  2. Step 2: Convert to fraction form
    809/1,213.50 = 1,213.50/x
  3. Step 3: Cross multiply
    809x = 1,213.50 × 1,213.50
  4. Step 4: Simplify right side
    809x = 1,472,582.25
  5. Step 5: Solve for x
    x = 1,472,582.25/809
  6. Step 6: Final answer
    x = 1,820.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.