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Finding the Fourth Proportional to 1,083.63, 1,626.16 and 399.63

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Solution

The fourth proportional to 1,083.63, 1,626.16 and 399.63 is: 599.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.63 : 1,626.16 = 399.63 : x
  2. Step 2: Convert to fraction form
    1,083.63/1,626.16 = 399.63/x
  3. Step 3: Cross multiply
    1,083.63x = 1,626.16 × 399.63
  4. Step 4: Simplify right side
    1,083.63x = 649,862.32
  5. Step 5: Solve for x
    x = 649,862.32/1,083.63
  6. Step 6: Final answer
    x = 599.71

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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.