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Finding the Fourth Proportional to 1,099.29, 1,647.19 and 405

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Solution

The fourth proportional to 1,099.29, 1,647.19 and 405 is: 606.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.29 : 1,647.19 = 405 : x
  2. Step 2: Convert to fraction form
    1,099.29/1,647.19 = 405/x
  3. Step 3: Cross multiply
    1,099.29x = 1,647.19 × 405
  4. Step 4: Simplify right side
    1,099.29x = 667,111.95
  5. Step 5: Solve for x
    x = 667,111.95/1,099.29
  6. Step 6: Final answer
    x = 606.86

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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.