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Finding the Fourth Proportional to 128,469.90, 192,704.85 and 81,230.70

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Solution

The fourth proportional to 128,469.90, 192,704.85 and 81,230.70 is: 121,846.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,469.90 : 192,704.85 = 81,230.70 : x
  2. Step 2: Convert to fraction form
    128,469.90/192,704.85 = 81,230.70/x
  3. Step 3: Cross multiply
    128,469.90x = 192,704.85 × 81,230.70
  4. Step 4: Simplify right side
    128,469.90x = 15,653,549,858.90
  5. Step 5: Solve for x
    x = 15,653,549,858.90/128,469.90
  6. Step 6: Final answer
    x = 121,846.05

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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.