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Finding the Fourth Proportional to 128,906.60, 193,359.90 and 69,857.60

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Solution

The fourth proportional to 128,906.60, 193,359.90 and 69,857.60 is: 104,786.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,906.60 : 193,359.90 = 69,857.60 : x
  2. Step 2: Convert to fraction form
    128,906.60/193,359.90 = 69,857.60/x
  3. Step 3: Cross multiply
    128,906.60x = 193,359.90 × 69,857.60
  4. Step 4: Simplify right side
    128,906.60x = 13,507,658,550.24
  5. Step 5: Solve for x
    x = 13,507,658,550.24/128,906.60
  6. Step 6: Final answer
    x = 104,786.40

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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.