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Finding the Fourth Proportional to 128,768.94, 193,066.74 and 49,790.70

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Solution

The fourth proportional to 128,768.94, 193,066.74 and 49,790.70 is: 74,652.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,768.94 : 193,066.74 = 49,790.70 : x
  2. Step 2: Convert to fraction form
    128,768.94/193,066.74 = 49,790.70/x
  3. Step 3: Cross multiply
    128,768.94x = 193,066.74 × 49,790.70
  4. Step 4: Simplify right side
    128,768.94x = 9,612,928,131.32
  5. Step 5: Solve for x
    x = 9,612,928,131.32/128,768.94
  6. Step 6: Final answer
    x = 74,652.54

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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.