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Finding the Fourth Proportional to 128,790.80, 193,200.60 and 40,043.60

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Solution

The fourth proportional to 128,790.80, 193,200.60 and 40,043.60 is: 60,069.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,790.80 : 193,200.60 = 40,043.60 : x
  2. Step 2: Convert to fraction form
    128,790.80/193,200.60 = 40,043.60/x
  3. Step 3: Cross multiply
    128,790.80x = 193,200.60 × 40,043.60
  4. Step 4: Simplify right side
    128,790.80x = 7,736,447,546.16
  5. Step 5: Solve for x
    x = 7,736,447,546.16/128,790.80
  6. Step 6: Final answer
    x = 60,069.88

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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.