Home / 21,982.12-32,982.32-12,120.60

Finding the Fourth Proportional to 21,982.12, 32,982.32 and 12,120.60

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Solution

The fourth proportional to 21,982.12, 32,982.32 and 12,120.60 is: 18,185.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,982.12 : 32,982.32 = 12,120.60 : x
  2. Step 2: Convert to fraction form
    21,982.12/32,982.32 = 12,120.60/x
  3. Step 3: Cross multiply
    21,982.12x = 32,982.32 × 12,120.60
  4. Step 4: Simplify right side
    21,982.12x = 399,765,507.79
  5. Step 5: Solve for x
    x = 399,765,507.79/21,982.12
  6. Step 6: Final answer
    x = 18,185.94

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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.