Home / 205,836.80-308,755.20-81,161.60

Finding the Fourth Proportional to 205,836.80, 308,755.20 and 81,161.60

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Solution

The fourth proportional to 205,836.80, 308,755.20 and 81,161.60 is: 121,742.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,836.80 : 308,755.20 = 81,161.60 : x
  2. Step 2: Convert to fraction form
    205,836.80/308,755.20 = 81,161.60/x
  3. Step 3: Cross multiply
    205,836.80x = 308,755.20 × 81,161.60
  4. Step 4: Simplify right side
    205,836.80x = 25,059,066,040.32
  5. Step 5: Solve for x
    x = 25,059,066,040.32/205,836.80
  6. Step 6: Final answer
    x = 121,742.40

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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.