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Finding the Third Proportional to 1,272 and 1,990.13

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Solution

The third proportional to 1,272 and 1,990.13 is: 3,113.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272 : 1,990.13 = 1,990.13 : x
  2. Step 2: Convert to fraction form
    1,272/1,990.13 = 1,990.13/x
  3. Step 3: Cross multiply
    1,272x = 1,990.13 × 1,990.13
  4. Step 4: Simplify right side
    1,272x = 3,960,597.52
  5. Step 5: Solve for x
    x = 3,960,597.52/1,272
  6. Step 6: Final answer
    x = 3,113.68

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.