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Finding the Fourth Proportional to 11,919.84, 17,879.96 and 4,128.88

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Solution

The fourth proportional to 11,919.84, 17,879.96 and 4,128.88 is: 6,193.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,919.84 : 17,879.96 = 4,128.88 : x
  2. Step 2: Convert to fraction form
    11,919.84/17,879.96 = 4,128.88/x
  3. Step 3: Cross multiply
    11,919.84x = 17,879.96 × 4,128.88
  4. Step 4: Simplify right side
    11,919.84x = 73,824,209.24
  5. Step 5: Solve for x
    x = 73,824,209.24/11,919.84
  6. Step 6: Final answer
    x = 6,193.39

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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.