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Finding the Fourth Proportional to 128,311.60, 192,467.40 and 81,072.40

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Solution

The fourth proportional to 128,311.60, 192,467.40 and 81,072.40 is: 121,608.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,311.60 : 192,467.40 = 81,072.40 : x
  2. Step 2: Convert to fraction form
    128,311.60/192,467.40 = 81,072.40/x
  3. Step 3: Cross multiply
    128,311.60x = 192,467.40 × 81,072.40
  4. Step 4: Simplify right side
    128,311.60x = 15,603,794,039.76
  5. Step 5: Solve for x
    x = 15,603,794,039.76/128,311.60
  6. Step 6: Final answer
    x = 121,608.60

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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.