Home / 1,086.40-1,629.42-355.90

Finding the Fourth Proportional to 1,086.40, 1,629.42 and 355.90

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Solution

The fourth proportional to 1,086.40, 1,629.42 and 355.90 is: 533.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.40 : 1,629.42 = 355.90 : x
  2. Step 2: Convert to fraction form
    1,086.40/1,629.42 = 355.90/x
  3. Step 3: Cross multiply
    1,086.40x = 1,629.42 × 355.90
  4. Step 4: Simplify right side
    1,086.40x = 579,910.58
  5. Step 5: Solve for x
    x = 579,910.58/1,086.40
  6. Step 6: Final answer
    x = 533.79

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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.