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Finding the Fourth Proportional to 7,919.80, 11,879.59 and 4,653.61

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Solution

The fourth proportional to 7,919.80, 11,879.59 and 4,653.61 is: 6,980.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,919.80 : 11,879.59 = 4,653.61 : x
  2. Step 2: Convert to fraction form
    7,919.80/11,879.59 = 4,653.61/x
  3. Step 3: Cross multiply
    7,919.80x = 11,879.59 × 4,653.61
  4. Step 4: Simplify right side
    7,919.80x = 55,282,978.82
  5. Step 5: Solve for x
    x = 55,282,978.82/7,919.80
  6. Step 6: Final answer
    x = 6,980.35

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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.