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Finding the Fourth Proportional to 128,960.93, 193,160.93 and 78,889.56

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Solution

The fourth proportional to 128,960.93, 193,160.93 and 78,889.56 is: 118,162.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,960.93 : 193,160.93 = 78,889.56 : x
  2. Step 2: Convert to fraction form
    128,960.93/193,160.93 = 78,889.56/x
  3. Step 3: Cross multiply
    128,960.93x = 193,160.93 × 78,889.56
  4. Step 4: Simplify right side
    128,960.93x = 15,238,380,382.44
  5. Step 5: Solve for x
    x = 15,238,380,382.44/128,960.93
  6. Step 6: Final answer
    x = 118,162.77

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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.