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Finding the Fourth Proportional to 983.21, 1,355.19 and 843.49

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Solution

The fourth proportional to 983.21, 1,355.19 and 843.49 is: 1,162.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.21 : 1,355.19 = 843.49 : x
  2. Step 2: Convert to fraction form
    983.21/1,355.19 = 843.49/x
  3. Step 3: Cross multiply
    983.21x = 1,355.19 × 843.49
  4. Step 4: Simplify right side
    983.21x = 1,143,087.29
  5. Step 5: Solve for x
    x = 1,143,087.29/983.21
  6. Step 6: Final answer
    x = 1,162.61

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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.