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Finding the Fourth Proportional to 1,208.91, 1,813.67 and 343.22

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Solution

The fourth proportional to 1,208.91, 1,813.67 and 343.22 is: 514.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.91 : 1,813.67 = 343.22 : x
  2. Step 2: Convert to fraction form
    1,208.91/1,813.67 = 343.22/x
  3. Step 3: Cross multiply
    1,208.91x = 1,813.67 × 343.22
  4. Step 4: Simplify right side
    1,208.91x = 622,477.03
  5. Step 5: Solve for x
    x = 622,477.03/1,208.91
  6. Step 6: Final answer
    x = 514.91

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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.