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Finding the Fourth Proportional to 2,143.19, 3,212.73 and 755.61

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Solution

The fourth proportional to 2,143.19, 3,212.73 and 755.61 is: 1,132.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,143.19 : 3,212.73 = 755.61 : x
  2. Step 2: Convert to fraction form
    2,143.19/3,212.73 = 755.61/x
  3. Step 3: Cross multiply
    2,143.19x = 3,212.73 × 755.61
  4. Step 4: Simplify right side
    2,143.19x = 2,427,570.92
  5. Step 5: Solve for x
    x = 2,427,570.92/2,143.19
  6. Step 6: Final answer
    x = 1,132.69

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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.