Home / 1,221.24-1,831.92-399.18

Finding the Fourth Proportional to 1,221.24, 1,831.92 and 399.18

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Solution

The fourth proportional to 1,221.24, 1,831.92 and 399.18 is: 598.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.24 : 1,831.92 = 399.18 : x
  2. Step 2: Convert to fraction form
    1,221.24/1,831.92 = 399.18/x
  3. Step 3: Cross multiply
    1,221.24x = 1,831.92 × 399.18
  4. Step 4: Simplify right side
    1,221.24x = 731,265.83
  5. Step 5: Solve for x
    x = 731,265.83/1,221.24
  6. Step 6: Final answer
    x = 598.79

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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.