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Finding the Fourth Proportional to 3,909.36, 5,858.28 and 3,621.36

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Solution

The fourth proportional to 3,909.36, 5,858.28 and 3,621.36 is: 5,426.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.36 : 5,858.28 = 3,621.36 : x
  2. Step 2: Convert to fraction form
    3,909.36/5,858.28 = 3,621.36/x
  3. Step 3: Cross multiply
    3,909.36x = 5,858.28 × 3,621.36
  4. Step 4: Simplify right side
    3,909.36x = 21,214,940.86
  5. Step 5: Solve for x
    x = 21,214,940.86/3,909.36
  6. Step 6: Final answer
    x = 5,426.70

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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.