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Finding the Fourth Proportional to 192,485.70, 288,777.69 and 80,128.56

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Solution

The fourth proportional to 192,485.70, 288,777.69 and 80,128.56 is: 120,213.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    192,485.70 : 288,777.69 = 80,128.56 : x
  2. Step 2: Convert to fraction form
    192,485.70/288,777.69 = 80,128.56/x
  3. Step 3: Cross multiply
    192,485.70x = 288,777.69 × 80,128.56
  4. Step 4: Simplify right side
    192,485.70x = 23,139,340,459.83
  5. Step 5: Solve for x
    x = 23,139,340,459.83/192,485.70
  6. Step 6: Final answer
    x = 120,213.30

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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.