Home / 121,831.54-168,128.55-67,382.80

Finding the Fourth Proportional to 121,831.54, 168,128.55 and 67,382.80

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Solution

The fourth proportional to 121,831.54, 168,128.55 and 67,382.80 is: 92,988.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,831.54 : 168,128.55 = 67,382.80 : x
  2. Step 2: Convert to fraction form
    121,831.54/168,128.55 = 67,382.80/x
  3. Step 3: Cross multiply
    121,831.54x = 168,128.55 × 67,382.80
  4. Step 4: Simplify right side
    121,831.54x = 11,328,972,458.94
  5. Step 5: Solve for x
    x = 11,328,972,458.94/121,831.54
  6. Step 6: Final answer
    x = 92,988.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.