Home / 1,221.05-1,831.24-343.50

Finding the Fourth Proportional to 1,221.05, 1,831.24 and 343.50

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Solution

The fourth proportional to 1,221.05, 1,831.24 and 343.50 is: 515.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.05 : 1,831.24 = 343.50 : x
  2. Step 2: Convert to fraction form
    1,221.05/1,831.24 = 343.50/x
  3. Step 3: Cross multiply
    1,221.05x = 1,831.24 × 343.50
  4. Step 4: Simplify right side
    1,221.05x = 629,030.94
  5. Step 5: Solve for x
    x = 629,030.94/1,221.05
  6. Step 6: Final answer
    x = 515.16

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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.