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Finding the Third Proportional to 1,991 and 4,699.50

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Solution

The third proportional to 1,991 and 4,699.50 is: 11,092.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991 : 4,699.50 = 4,699.50 : x
  2. Step 2: Convert to fraction form
    1,991/4,699.50 = 4,699.50/x
  3. Step 3: Cross multiply
    1,991x = 4,699.50 × 4,699.50
  4. Step 4: Simplify right side
    1,991x = 22,085,300.25
  5. Step 5: Solve for x
    x = 22,085,300.25/1,991
  6. Step 6: Final answer
    x = 11,092.57

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.