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Finding the Fourth Proportional to 2,142.81, 3,214.47 and 755.86

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Solution

The fourth proportional to 2,142.81, 3,214.47 and 755.86 is: 1,133.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142.81 : 3,214.47 = 755.86 : x
  2. Step 2: Convert to fraction form
    2,142.81/3,214.47 = 755.86/x
  3. Step 3: Cross multiply
    2,142.81x = 3,214.47 × 755.86
  4. Step 4: Simplify right side
    2,142.81x = 2,429,669.44
  5. Step 5: Solve for x
    x = 2,429,669.44/2,142.81
  6. Step 6: Final answer
    x = 1,133.87

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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.