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Finding the Third Proportional to 1,891 and 3,109.50

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Solution

The third proportional to 1,891 and 3,109.50 is: 5,113.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,891 : 3,109.50 = 3,109.50 : x
  2. Step 2: Convert to fraction form
    1,891/3,109.50 = 3,109.50/x
  3. Step 3: Cross multiply
    1,891x = 3,109.50 × 3,109.50
  4. Step 4: Simplify right side
    1,891x = 9,668,990.25
  5. Step 5: Solve for x
    x = 9,668,990.25/1,891
  6. Step 6: Final answer
    x = 5,113.16

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.