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Finding the Fourth Proportional to 11,991.70, 17,989.61 and 3,671.51

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Solution

The fourth proportional to 11,991.70, 17,989.61 and 3,671.51 is: 5,507.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,991.70 : 17,989.61 = 3,671.51 : x
  2. Step 2: Convert to fraction form
    11,991.70/17,989.61 = 3,671.51/x
  3. Step 3: Cross multiply
    11,991.70x = 17,989.61 × 3,671.51
  4. Step 4: Simplify right side
    11,991.70x = 66,049,033.01
  5. Step 5: Solve for x
    x = 66,049,033.01/11,991.70
  6. Step 6: Final answer
    x = 5,507.90

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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.