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Finding the Fourth Proportional to 3,937.81, 5,910.36 and 1,991.38

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Solution

The fourth proportional to 3,937.81, 5,910.36 and 1,991.38 is: 2,988.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,937.81 : 5,910.36 = 1,991.38 : x
  2. Step 2: Convert to fraction form
    3,937.81/5,910.36 = 1,991.38/x
  3. Step 3: Cross multiply
    3,937.81x = 5,910.36 × 1,991.38
  4. Step 4: Simplify right side
    3,937.81x = 11,769,772.70
  5. Step 5: Solve for x
    x = 11,769,772.70/3,937.81
  6. Step 6: Final answer
    x = 2,988.91

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1.5x scale

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.