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Finding the Fourth Proportional to 128,518.60, 192,720.30 and 58,361.80

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Solution

The fourth proportional to 128,518.60, 192,720.30 and 58,361.80 is: 87,516.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,518.60 : 192,720.30 = 58,361.80 : x
  2. Step 2: Convert to fraction form
    128,518.60/192,720.30 = 58,361.80/x
  3. Step 3: Cross multiply
    128,518.60x = 192,720.30 × 58,361.80
  4. Step 4: Simplify right side
    128,518.60x = 11,247,503,604.54
  5. Step 5: Solve for x
    x = 11,247,503,604.54/128,518.60
  6. Step 6: Final answer
    x = 87,516.54

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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.