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Finding the Fourth Proportional to 128,322.60, 192,119.40 and 121,340.40

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Solution

The fourth proportional to 128,322.60, 192,119.40 and 121,340.40 is: 181,665.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,322.60 : 192,119.40 = 121,340.40 : x
  2. Step 2: Convert to fraction form
    128,322.60/192,119.40 = 121,340.40/x
  3. Step 3: Cross multiply
    128,322.60x = 192,119.40 × 121,340.40
  4. Step 4: Simplify right side
    128,322.60x = 23,311,844,843.76
  5. Step 5: Solve for x
    x = 23,311,844,843.76/128,322.60
  6. Step 6: Final answer
    x = 181,665.93

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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.