Home / 1,086.45-1,629.19-393.09

Finding the Fourth Proportional to 1,086.45, 1,629.19 and 393.09

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Solution

The fourth proportional to 1,086.45, 1,629.19 and 393.09 is: 589.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.45 : 1,629.19 = 393.09 : x
  2. Step 2: Convert to fraction form
    1,086.45/1,629.19 = 393.09/x
  3. Step 3: Cross multiply
    1,086.45x = 1,629.19 × 393.09
  4. Step 4: Simplify right side
    1,086.45x = 640,418.30
  5. Step 5: Solve for x
    x = 640,418.30/1,086.45
  6. Step 6: Final answer
    x = 589.46

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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.