Home / 1,086.40-1,629.76-355.84

Finding the Fourth Proportional to 1,086.40, 1,629.76 and 355.84

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Solution

The fourth proportional to 1,086.40, 1,629.76 and 355.84 is: 533.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.40 : 1,629.76 = 355.84 : x
  2. Step 2: Convert to fraction form
    1,086.40/1,629.76 = 355.84/x
  3. Step 3: Cross multiply
    1,086.40x = 1,629.76 × 355.84
  4. Step 4: Simplify right side
    1,086.40x = 579,933.80
  5. Step 5: Solve for x
    x = 579,933.80/1,086.40
  6. Step 6: Final answer
    x = 533.81

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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.