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Finding the Third Proportional to 991.88 and 2,172.75

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Solution

The third proportional to 991.88 and 2,172.75 is: 4,759.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.88 : 2,172.75 = 2,172.75 : x
  2. Step 2: Convert to fraction form
    991.88/2,172.75 = 2,172.75/x
  3. Step 3: Cross multiply
    991.88x = 2,172.75 × 2,172.75
  4. Step 4: Simplify right side
    991.88x = 4,720,842.56
  5. Step 5: Solve for x
    x = 4,720,842.56/991.88
  6. Step 6: Final answer
    x = 4,759.51

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.