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Finding the Fourth Proportional to 3,661.57, 5,489.47 and 1,321.21

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Solution

The fourth proportional to 3,661.57, 5,489.47 and 1,321.21 is: 1,980.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,661.57 : 5,489.47 = 1,321.21 : x
  2. Step 2: Convert to fraction form
    3,661.57/5,489.47 = 1,321.21/x
  3. Step 3: Cross multiply
    3,661.57x = 5,489.47 × 1,321.21
  4. Step 4: Simplify right side
    3,661.57x = 7,252,742.66
  5. Step 5: Solve for x
    x = 7,252,742.66/3,661.57
  6. Step 6: Final answer
    x = 1,980.77

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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.