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Finding the Fourth Proportional to 6,999.80, 9,659.68 and 3,855.98

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Solution

The fourth proportional to 6,999.80, 9,659.68 and 3,855.98 is: 5,321.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,999.80 : 9,659.68 = 3,855.98 : x
  2. Step 2: Convert to fraction form
    6,999.80/9,659.68 = 3,855.98/x
  3. Step 3: Cross multiply
    6,999.80x = 9,659.68 × 3,855.98
  4. Step 4: Simplify right side
    6,999.80x = 37,247,532.89
  5. Step 5: Solve for x
    x = 37,247,532.89/6,999.80
  6. Step 6: Final answer
    x = 5,321.23

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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.