Home / 1,221.07-1,831.37-331.61

Finding the Fourth Proportional to 1,221.07, 1,831.37 and 331.61

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Solution

The fourth proportional to 1,221.07, 1,831.37 and 331.61 is: 497.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.07 : 1,831.37 = 331.61 : x
  2. Step 2: Convert to fraction form
    1,221.07/1,831.37 = 331.61/x
  3. Step 3: Cross multiply
    1,221.07x = 1,831.37 × 331.61
  4. Step 4: Simplify right side
    1,221.07x = 607,289.79
  5. Step 5: Solve for x
    x = 607,289.79/1,221.07
  6. Step 6: Final answer
    x = 497.34

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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.