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Finding the Fourth Proportional to 843.21, 1,162.31 and 621.81

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Solution

The fourth proportional to 843.21, 1,162.31 and 621.81 is: 857.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.21 : 1,162.31 = 621.81 : x
  2. Step 2: Convert to fraction form
    843.21/1,162.31 = 621.81/x
  3. Step 3: Cross multiply
    843.21x = 1,162.31 × 621.81
  4. Step 4: Simplify right side
    843.21x = 722,732.87
  5. Step 5: Solve for x
    x = 722,732.87/843.21
  6. Step 6: Final answer
    x = 857.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.