Home / 1,221.21-1,831.82-355.59

Finding the Fourth Proportional to 1,221.21, 1,831.82 and 355.59

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Solution

The fourth proportional to 1,221.21, 1,831.82 and 355.59 is: 533.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.21 : 1,831.82 = 355.59 : x
  2. Step 2: Convert to fraction form
    1,221.21/1,831.82 = 355.59/x
  3. Step 3: Cross multiply
    1,221.21x = 1,831.82 × 355.59
  4. Step 4: Simplify right side
    1,221.21x = 651,375.10
  5. Step 5: Solve for x
    x = 651,375.10/1,221.21
  6. Step 6: Final answer
    x = 533.39

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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.