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Finding the Fourth Proportional to 128,158.81, 192,128.74 and 90,600.73

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Solution

The fourth proportional to 128,158.81, 192,128.74 and 90,600.73 is: 135,823.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,158.81 : 192,128.74 = 90,600.73 : x
  2. Step 2: Convert to fraction form
    128,158.81/192,128.74 = 90,600.73/x
  3. Step 3: Cross multiply
    128,158.81x = 192,128.74 × 90,600.73
  4. Step 4: Simplify right side
    128,158.81x = 17,407,004,097.98
  5. Step 5: Solve for x
    x = 17,407,004,097.98/128,158.81
  6. Step 6: Final answer
    x = 135,823.70

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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.