Home / 1,221.06-1,831.40-399.35

Finding the Fourth Proportional to 1,221.06, 1,831.40 and 399.35

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Solution

The fourth proportional to 1,221.06, 1,831.40 and 399.35 is: 598.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.06 : 1,831.40 = 399.35 : x
  2. Step 2: Convert to fraction form
    1,221.06/1,831.40 = 399.35/x
  3. Step 3: Cross multiply
    1,221.06x = 1,831.40 × 399.35
  4. Step 4: Simplify right side
    1,221.06x = 731,358.44
  5. Step 5: Solve for x
    x = 731,358.44/1,221.06
  6. Step 6: Final answer
    x = 598.95

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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.