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Finding the Fourth Proportional to 12,128.80, 18,204.80 and 6,289.60

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Solution

The fourth proportional to 12,128.80, 18,204.80 and 6,289.60 is: 9,440.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,128.80 : 18,204.80 = 6,289.60 : x
  2. Step 2: Convert to fraction form
    12,128.80/18,204.80 = 6,289.60/x
  3. Step 3: Cross multiply
    12,128.80x = 18,204.80 × 6,289.60
  4. Step 4: Simplify right side
    12,128.80x = 114,500,910.08
  5. Step 5: Solve for x
    x = 114,500,910.08/12,128.80
  6. Step 6: Final answer
    x = 9,440.42

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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.