Home / 1,086.99-1,631.34-393.85

Finding the Fourth Proportional to 1,086.99, 1,631.34 and 393.85

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Solution

The fourth proportional to 1,086.99, 1,631.34 and 393.85 is: 591.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.99 : 1,631.34 = 393.85 : x
  2. Step 2: Convert to fraction form
    1,086.99/1,631.34 = 393.85/x
  3. Step 3: Cross multiply
    1,086.99x = 1,631.34 × 393.85
  4. Step 4: Simplify right side
    1,086.99x = 642,508.43
  5. Step 5: Solve for x
    x = 642,508.43/1,086.99
  6. Step 6: Final answer
    x = 591.09

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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.