Home / 1,221.28-1,831.89-355.60

Finding the Fourth Proportional to 1,221.28, 1,831.89 and 355.60

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Solution

The fourth proportional to 1,221.28, 1,831.89 and 355.60 is: 533.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.28 : 1,831.89 = 355.60 : x
  2. Step 2: Convert to fraction form
    1,221.28/1,831.89 = 355.60/x
  3. Step 3: Cross multiply
    1,221.28x = 1,831.89 × 355.60
  4. Step 4: Simplify right side
    1,221.28x = 651,420.08
  5. Step 5: Solve for x
    x = 651,420.08/1,221.28
  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.