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Finding the Third Proportional to 853.50 and 1,212

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Solution

The third proportional to 853.50 and 1,212 is: 1,721.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.50 : 1,212 = 1,212 : x
  2. Step 2: Convert to fraction form
    853.50/1,212 = 1,212/x
  3. Step 3: Cross multiply
    853.50x = 1,212 × 1,212
  4. Step 4: Simplify right side
    853.50x = 1,468,944
  5. Step 5: Solve for x
    x = 1,468,944/853.50
  6. Step 6: Final answer
    x = 1,721.08

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.