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Finding the Third Proportional to 1,211 and 1,312

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Solution

The third proportional to 1,211 and 1,312 is: 1,421.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211 : 1,312 = 1,312 : x
  2. Step 2: Convert to fraction form
    1,211/1,312 = 1,312/x
  3. Step 3: Cross multiply
    1,211x = 1,312 × 1,312
  4. Step 4: Simplify right side
    1,211x = 1,721,344
  5. Step 5: Solve for x
    x = 1,721,344/1,211
  6. Step 6: Final answer
    x = 1,421.42

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.