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Finding the Fourth Proportional to 1,208.75, 1,813.84 and 439.31

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Solution

The fourth proportional to 1,208.75, 1,813.84 and 439.31 is: 659.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.75 : 1,813.84 = 439.31 : x
  2. Step 2: Convert to fraction form
    1,208.75/1,813.84 = 439.31/x
  3. Step 3: Cross multiply
    1,208.75x = 1,813.84 × 439.31
  4. Step 4: Simplify right side
    1,208.75x = 796,834.61
  5. Step 5: Solve for x
    x = 796,834.61/1,208.75
  6. Step 6: Final answer
    x = 659.22

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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.