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Finding the Fourth Proportional to 2,107.64, 3,161.04 and 720.86

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Solution

The fourth proportional to 2,107.64, 3,161.04 and 720.86 is: 1,081.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,107.64 : 3,161.04 = 720.86 : x
  2. Step 2: Convert to fraction form
    2,107.64/3,161.04 = 720.86/x
  3. Step 3: Cross multiply
    2,107.64x = 3,161.04 × 720.86
  4. Step 4: Simplify right side
    2,107.64x = 2,278,651.49
  5. Step 5: Solve for x
    x = 2,278,651.49/2,107.64
  6. Step 6: Final answer
    x = 1,081.14

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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.