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Finding the Fourth Proportional to 7,919.55, 11,879.63 and 2,989.08

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Solution

The fourth proportional to 7,919.55, 11,879.63 and 2,989.08 is: 4,483.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,919.55 : 11,879.63 = 2,989.08 : x
  2. Step 2: Convert to fraction form
    7,919.55/11,879.63 = 2,989.08/x
  3. Step 3: Cross multiply
    7,919.55x = 11,879.63 × 2,989.08
  4. Step 4: Simplify right side
    7,919.55x = 35,509,164.44
  5. Step 5: Solve for x
    x = 35,509,164.44/7,919.55
  6. Step 6: Final answer
    x = 4,483.74

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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.