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Finding the Fourth Proportional to 3,991.59, 5,986.71 and 1,069.22

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Solution

The fourth proportional to 3,991.59, 5,986.71 and 1,069.22 is: 1,603.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.59 : 5,986.71 = 1,069.22 : x
  2. Step 2: Convert to fraction form
    3,991.59/5,986.71 = 1,069.22/x
  3. Step 3: Cross multiply
    3,991.59x = 5,986.71 × 1,069.22
  4. Step 4: Simplify right side
    3,991.59x = 6,401,080.13
  5. Step 5: Solve for x
    x = 6,401,080.13/3,991.59
  6. Step 6: Final answer
    x = 1,603.64

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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.