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Finding the Fourth Proportional to 3,121.93, 4,683 and 813.43

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Solution

The fourth proportional to 3,121.93, 4,683 and 813.43 is: 1,220.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.93 : 4,683 = 813.43 : x
  2. Step 2: Convert to fraction form
    3,121.93/4,683 = 813.43/x
  3. Step 3: Cross multiply
    3,121.93x = 4,683 × 813.43
  4. Step 4: Simplify right side
    3,121.93x = 3,809,292.69
  5. Step 5: Solve for x
    x = 3,809,292.69/3,121.93
  6. Step 6: Final answer
    x = 1,220.17

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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.