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Finding the Fourth Proportional to 3,881.21, 5,822.11 and 1,212.47

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Solution

The fourth proportional to 3,881.21, 5,822.11 and 1,212.47 is: 1,818.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,881.21 : 5,822.11 = 1,212.47 : x
  2. Step 2: Convert to fraction form
    3,881.21/5,822.11 = 1,212.47/x
  3. Step 3: Cross multiply
    3,881.21x = 5,822.11 × 1,212.47
  4. Step 4: Simplify right side
    3,881.21x = 7,059,133.71
  5. Step 5: Solve for x
    x = 7,059,133.71/3,881.21
  6. Step 6: Final answer
    x = 1,818.80

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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.