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Finding the Fourth Proportional to 2,121, 3,181.49 and 822.46

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Solution

The fourth proportional to 2,121, 3,181.49 and 822.46 is: 1,233.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121 : 3,181.49 = 822.46 : x
  2. Step 2: Convert to fraction form
    2,121/3,181.49 = 822.46/x
  3. Step 3: Cross multiply
    2,121x = 3,181.49 × 822.46
  4. Step 4: Simplify right side
    2,121x = 2,616,648.27
  5. Step 5: Solve for x
    x = 2,616,648.27/2,121
  6. Step 6: Final answer
    x = 1,233.69

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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.