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Finding the Fourth Proportional to 128,694.64, 192,828.60 and 91,068.28

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Solution

The fourth proportional to 128,694.64, 192,828.60 and 91,068.28 is: 136,451.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,694.64 : 192,828.60 = 91,068.28 : x
  2. Step 2: Convert to fraction form
    128,694.64/192,828.60 = 91,068.28/x
  3. Step 3: Cross multiply
    128,694.64x = 192,828.60 × 91,068.28
  4. Step 4: Simplify right side
    128,694.64x = 17,560,568,936.81
  5. Step 5: Solve for x
    x = 17,560,568,936.81/128,694.64
  6. Step 6: Final answer
    x = 136,451.44

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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.