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Finding the Fourth Proportional to 1,333.35, 1,999.36 and 408.73

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Solution

The fourth proportional to 1,333.35, 1,999.36 and 408.73 is: 612.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,333.35 : 1,999.36 = 408.73 : x
  2. Step 2: Convert to fraction form
    1,333.35/1,999.36 = 408.73/x
  3. Step 3: Cross multiply
    1,333.35x = 1,999.36 × 408.73
  4. Step 4: Simplify right side
    1,333.35x = 817,198.41
  5. Step 5: Solve for x
    x = 817,198.41/1,333.35
  6. Step 6: Final answer
    x = 612.89

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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.