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Finding the Fourth Proportional to 1,209.23, 1,813.84 and 343.55

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Solution

The fourth proportional to 1,209.23, 1,813.84 and 343.55 is: 515.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.23 : 1,813.84 = 343.55 : x
  2. Step 2: Convert to fraction form
    1,209.23/1,813.84 = 343.55/x
  3. Step 3: Cross multiply
    1,209.23x = 1,813.84 × 343.55
  4. Step 4: Simplify right side
    1,209.23x = 623,135.66
  5. Step 5: Solve for x
    x = 623,135.66/1,209.23
  6. Step 6: Final answer
    x = 515.32

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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.