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Finding the Fourth Proportional to 128,480.75, 192,720.05 and 100,424.40

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Solution

The fourth proportional to 128,480.75, 192,720.05 and 100,424.40 is: 150,635.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,480.75 : 192,720.05 = 100,424.40 : x
  2. Step 2: Convert to fraction form
    128,480.75/192,720.05 = 100,424.40/x
  3. Step 3: Cross multiply
    128,480.75x = 192,720.05 × 100,424.40
  4. Step 4: Simplify right side
    128,480.75x = 19,353,794,887.10
  5. Step 5: Solve for x
    x = 19,353,794,887.10/128,480.75
  6. Step 6: Final answer
    x = 150,635.76

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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.