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Finding the Fourth Proportional to 8,620.94, 11,896.80 and 5,085.30

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Solution

The fourth proportional to 8,620.94, 11,896.80 and 5,085.30 is: 7,017.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,620.94 : 11,896.80 = 5,085.30 : x
  2. Step 2: Convert to fraction form
    8,620.94/11,896.80 = 5,085.30/x
  3. Step 3: Cross multiply
    8,620.94x = 11,896.80 × 5,085.30
  4. Step 4: Simplify right side
    8,620.94x = 60,498,797.04
  5. Step 5: Solve for x
    x = 60,498,797.04/8,620.94
  6. Step 6: Final answer
    x = 7,017.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.