Home / 1,220.53-1,831.31-399.05

Finding the Fourth Proportional to 1,220.53, 1,831.31 and 399.05

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Solution

The fourth proportional to 1,220.53, 1,831.31 and 399.05 is: 598.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.53 : 1,831.31 = 399.05 : x
  2. Step 2: Convert to fraction form
    1,220.53/1,831.31 = 399.05/x
  3. Step 3: Cross multiply
    1,220.53x = 1,831.31 × 399.05
  4. Step 4: Simplify right side
    1,220.53x = 730,789.83
  5. Step 5: Solve for x
    x = 730,789.83/1,220.53
  6. Step 6: Final answer
    x = 598.75

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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.