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Finding the Fourth Proportional to 128,079.28, 192,128.14 and 49,193.50

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Solution

The fourth proportional to 128,079.28, 192,128.14 and 49,193.50 is: 73,793.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,079.28 : 192,128.14 = 49,193.50 : x
  2. Step 2: Convert to fraction form
    128,079.28/192,128.14 = 49,193.50/x
  3. Step 3: Cross multiply
    128,079.28x = 192,128.14 × 49,193.50
  4. Step 4: Simplify right side
    128,079.28x = 9,451,455,655.09
  5. Step 5: Solve for x
    x = 9,451,455,655.09/128,079.28
  6. Step 6: Final answer
    x = 73,793.79

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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.