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Finding the Fourth Proportional to 1,993.75, 2,991.11 and 625.75

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Solution

The fourth proportional to 1,993.75, 2,991.11 and 625.75 is: 938.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,993.75 : 2,991.11 = 625.75 : x
  2. Step 2: Convert to fraction form
    1,993.75/2,991.11 = 625.75/x
  3. Step 3: Cross multiply
    1,993.75x = 2,991.11 × 625.75
  4. Step 4: Simplify right side
    1,993.75x = 1,871,687.08
  5. Step 5: Solve for x
    x = 1,871,687.08/1,993.75
  6. Step 6: Final answer
    x = 938.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.