Home / 1,086.87-1,629.92-393.36

Finding the Fourth Proportional to 1,086.87, 1,629.92 and 393.36

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Solution

The fourth proportional to 1,086.87, 1,629.92 and 393.36 is: 589.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.87 : 1,629.92 = 393.36 : x
  2. Step 2: Convert to fraction form
    1,086.87/1,629.92 = 393.36/x
  3. Step 3: Cross multiply
    1,086.87x = 1,629.92 × 393.36
  4. Step 4: Simplify right side
    1,086.87x = 641,143.36
  5. Step 5: Solve for x
    x = 641,143.36/1,086.87
  6. Step 6: Final answer
    x = 589.90

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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.