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Finding the Fourth Proportional to 2,147.81, 3,223.20 and 849.38

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Solution

The fourth proportional to 2,147.81, 3,223.20 and 849.38 is: 1,274.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,147.81 : 3,223.20 = 849.38 : x
  2. Step 2: Convert to fraction form
    2,147.81/3,223.20 = 849.38/x
  3. Step 3: Cross multiply
    2,147.81x = 3,223.20 × 849.38
  4. Step 4: Simplify right side
    2,147.81x = 2,737,721.62
  5. Step 5: Solve for x
    x = 2,737,721.62/2,147.81
  6. Step 6: Final answer
    x = 1,274.66

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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.