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Finding the Fourth Proportional to 101,079.20, 151,359.60 and 74,640.80

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Solution

The fourth proportional to 101,079.20, 151,359.60 and 74,640.80 is: 111,769.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,079.20 : 151,359.60 = 74,640.80 : x
  2. Step 2: Convert to fraction form
    101,079.20/151,359.60 = 74,640.80/x
  3. Step 3: Cross multiply
    101,079.20x = 151,359.60 × 74,640.80
  4. Step 4: Simplify right side
    101,079.20x = 11,297,601,631.68
  5. Step 5: Solve for x
    x = 11,297,601,631.68/101,079.20
  6. Step 6: Final answer
    x = 111,769.80

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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.