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Finding the Fourth Proportional to 1,209.08, 1,813.42 and 343.18

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Solution

The fourth proportional to 1,209.08, 1,813.42 and 343.18 is: 514.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.08 : 1,813.42 = 343.18 : x
  2. Step 2: Convert to fraction form
    1,209.08/1,813.42 = 343.18/x
  3. Step 3: Cross multiply
    1,209.08x = 1,813.42 × 343.18
  4. Step 4: Simplify right side
    1,209.08x = 622,329.48
  5. Step 5: Solve for x
    x = 622,329.48/1,209.08
  6. Step 6: Final answer
    x = 514.71

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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.