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Finding the Fourth Proportional to 7,918.80, 11,879.99 and 4,219.08

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Solution

The fourth proportional to 7,918.80, 11,879.99 and 4,219.08 is: 6,329.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,918.80 : 11,879.99 = 4,219.08 : x
  2. Step 2: Convert to fraction form
    7,918.80/11,879.99 = 4,219.08/x
  3. Step 3: Cross multiply
    7,918.80x = 11,879.99 × 4,219.08
  4. Step 4: Simplify right side
    7,918.80x = 50,122,628.21
  5. Step 5: Solve for x
    x = 50,122,628.21/7,918.80
  6. Step 6: Final answer
    x = 6,329.57

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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.