Home / 1,221.24-1,831.46-399.32

Finding the Fourth Proportional to 1,221.24, 1,831.46 and 399.32

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Solution

The fourth proportional to 1,221.24, 1,831.46 and 399.32 is: 598.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.24 : 1,831.46 = 399.32 : x
  2. Step 2: Convert to fraction form
    1,221.24/1,831.46 = 399.32/x
  3. Step 3: Cross multiply
    1,221.24x = 1,831.46 × 399.32
  4. Step 4: Simplify right side
    1,221.24x = 731,338.61
  5. Step 5: Solve for x
    x = 731,338.61/1,221.24
  6. Step 6: Final answer
    x = 598.85

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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.