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Finding the Fourth Proportional to 1,333.41, 1,999.99 and 409.61

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Solution

The fourth proportional to 1,333.41, 1,999.99 and 409.61 is: 614.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,333.41 : 1,999.99 = 409.61 : x
  2. Step 2: Convert to fraction form
    1,333.41/1,999.99 = 409.61/x
  3. Step 3: Cross multiply
    1,333.41x = 1,999.99 × 409.61
  4. Step 4: Simplify right side
    1,333.41x = 819,210.17
  5. Step 5: Solve for x
    x = 819,210.17/1,333.41
  6. Step 6: Final answer
    x = 614.37

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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.