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Finding the Fourth Proportional to 128,906.40, 193,505.40 and 69,711.60

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Solution

The fourth proportional to 128,906.40, 193,505.40 and 69,711.60 is: 104,646.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,906.40 : 193,505.40 = 69,711.60 : x
  2. Step 2: Convert to fraction form
    128,906.40/193,505.40 = 69,711.60/x
  3. Step 3: Cross multiply
    128,906.40x = 193,505.40 × 69,711.60
  4. Step 4: Simplify right side
    128,906.40x = 13,489,571,042.64
  5. Step 5: Solve for x
    x = 13,489,571,042.64/128,906.40
  6. Step 6: Final answer
    x = 104,646.25

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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.