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Finding the Fourth Proportional to 128,969.76, 193,380.14 and 49,991.72

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Solution

The fourth proportional to 128,969.76, 193,380.14 and 49,991.72 is: 74,958.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,969.76 : 193,380.14 = 49,991.72 : x
  2. Step 2: Convert to fraction form
    128,969.76/193,380.14 = 49,991.72/x
  3. Step 3: Cross multiply
    128,969.76x = 193,380.14 × 49,991.72
  4. Step 4: Simplify right side
    128,969.76x = 9,667,405,812.44
  5. Step 5: Solve for x
    x = 9,667,405,812.44/128,969.76
  6. Step 6: Final answer
    x = 74,958.70

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1.5x scale

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.