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Finding the Fourth Proportional to 1,208.22, 1,811.18 and 385.97

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Solution

The fourth proportional to 1,208.22, 1,811.18 and 385.97 is: 578.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.22 : 1,811.18 = 385.97 : x
  2. Step 2: Convert to fraction form
    1,208.22/1,811.18 = 385.97/x
  3. Step 3: Cross multiply
    1,208.22x = 1,811.18 × 385.97
  4. Step 4: Simplify right side
    1,208.22x = 699,053.05
  5. Step 5: Solve for x
    x = 699,053.05/1,208.22
  6. Step 6: Final answer
    x = 578.58

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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.