Home / 1,221.20-1,831.80-355.51

Finding the Fourth Proportional to 1,221.20, 1,831.80 and 355.51

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Solution

The fourth proportional to 1,221.20, 1,831.80 and 355.51 is: 533.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.20 : 1,831.80 = 355.51 : x
  2. Step 2: Convert to fraction form
    1,221.20/1,831.80 = 355.51/x
  3. Step 3: Cross multiply
    1,221.20x = 1,831.80 × 355.51
  4. Step 4: Simplify right side
    1,221.20x = 651,221.44
  5. Step 5: Solve for x
    x = 651,221.44/1,221.20
  6. Step 6: Final answer
    x = 533.27

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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.