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Finding the Fourth Proportional to 128,018.40, 192,027.60 and 105,856.80

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Solution

The fourth proportional to 128,018.40, 192,027.60 and 105,856.80 is: 158,785.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,018.40 : 192,027.60 = 105,856.80 : x
  2. Step 2: Convert to fraction form
    128,018.40/192,027.60 = 105,856.80/x
  3. Step 3: Cross multiply
    128,018.40x = 192,027.60 × 105,856.80
  4. Step 4: Simplify right side
    128,018.40x = 20,327,427,247.68
  5. Step 5: Solve for x
    x = 20,327,427,247.68/128,018.40
  6. Step 6: Final answer
    x = 158,785.20

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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.