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Finding the Fourth Proportional to 1,333.31, 1,999.89 and 408.90

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Solution

The fourth proportional to 1,333.31, 1,999.89 and 408.90 is: 613.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,333.31 : 1,999.89 = 408.90 : x
  2. Step 2: Convert to fraction form
    1,333.31/1,999.89 = 408.90/x
  3. Step 3: Cross multiply
    1,333.31x = 1,999.89 × 408.90
  4. Step 4: Simplify right side
    1,333.31x = 817,751.27
  5. Step 5: Solve for x
    x = 817,751.27/1,333.31
  6. Step 6: Final answer
    x = 613.32

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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.