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Finding the Fourth Proportional to 121,279,361.80, 181,919,042.70 and 66,670,846.60

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Solution

The fourth proportional to 121,279,361.80, 181,919,042.70 and 66,670,846.60 is: 100,006,269.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,279,361.80 : 181,919,042.70 = 66,670,846.60 : x
  2. Step 2: Convert to fraction form
    121,279,361.80/181,919,042.70 = 66,670,846.60/x
  3. Step 3: Cross multiply
    121,279,361.80x = 181,919,042.70 × 66,670,846.60
  4. Step 4: Simplify right side
    121,279,361.80x = 12,128,696,589,470,550
  5. Step 5: Solve for x
    x = 12,128,696,589,470,550/121,279,361.80
  6. Step 6: Final answer
    x = 100,006,269.90

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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.