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Finding the Fourth Proportional to 128,940.40, 193,410.60 and 81,701.20

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Solution

The fourth proportional to 128,940.40, 193,410.60 and 81,701.20 is: 122,551.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,940.40 : 193,410.60 = 81,701.20 : x
  2. Step 2: Convert to fraction form
    128,940.40/193,410.60 = 81,701.20/x
  3. Step 3: Cross multiply
    128,940.40x = 193,410.60 × 81,701.20
  4. Step 4: Simplify right side
    128,940.40x = 15,801,878,112.72
  5. Step 5: Solve for x
    x = 15,801,878,112.72/128,940.40
  6. Step 6: Final answer
    x = 122,551.80

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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.