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Finding the Fourth Proportional to 2,143.13, 3,214.69 and 682.39

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Solution

The fourth proportional to 2,143.13, 3,214.69 and 682.39 is: 1,023.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,143.13 : 3,214.69 = 682.39 : x
  2. Step 2: Convert to fraction form
    2,143.13/3,214.69 = 682.39/x
  3. Step 3: Cross multiply
    2,143.13x = 3,214.69 × 682.39
  4. Step 4: Simplify right side
    2,143.13x = 2,193,674.62
  5. Step 5: Solve for x
    x = 2,193,674.62/2,143.13
  6. Step 6: Final answer
    x = 1,023.59

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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.