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Finding the Fourth Proportional to 128,372.60, 192,194.40 and 121,390.40

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Solution

The fourth proportional to 128,372.60, 192,194.40 and 121,390.40 is: 181,740.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,372.60 : 192,194.40 = 121,390.40 : x
  2. Step 2: Convert to fraction form
    128,372.60/192,194.40 = 121,390.40/x
  3. Step 3: Cross multiply
    128,372.60x = 192,194.40 × 121,390.40
  4. Step 4: Simplify right side
    128,372.60x = 23,330,555,093.76
  5. Step 5: Solve for x
    x = 23,330,555,093.76/128,372.60
  6. Step 6: Final answer
    x = 181,740.93

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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.