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Finding the Fourth Proportional to 3,937.62, 5,910.08 and 1,991.20

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Solution

The fourth proportional to 3,937.62, 5,910.08 and 1,991.20 is: 2,988.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,937.62 : 5,910.08 = 1,991.20 : x
  2. Step 2: Convert to fraction form
    3,937.62/5,910.08 = 1,991.20/x
  3. Step 3: Cross multiply
    3,937.62x = 5,910.08 × 1,991.20
  4. Step 4: Simplify right side
    3,937.62x = 11,768,151.30
  5. Step 5: Solve for x
    x = 11,768,151.30/3,937.62
  6. Step 6: Final answer
    x = 2,988.65

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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.