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Finding the Fourth Proportional to 3,991.15, 5,491.02 and 3,881.80

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Solution

The fourth proportional to 3,991.15, 5,491.02 and 3,881.80 is: 5,340.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.15 : 5,491.02 = 3,881.80 : x
  2. Step 2: Convert to fraction form
    3,991.15/5,491.02 = 3,881.80/x
  3. Step 3: Cross multiply
    3,991.15x = 5,491.02 × 3,881.80
  4. Step 4: Simplify right side
    3,991.15x = 21,315,041.44
  5. Step 5: Solve for x
    x = 21,315,041.44/3,991.15
  6. Step 6: Final answer
    x = 5,340.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.