Home / 12,163.13-18,221.09-7,990.47

Finding the Fourth Proportional to 12,163.13, 18,221.09 and 7,990.47

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Solution

The fourth proportional to 12,163.13, 18,221.09 and 7,990.47 is: 11,970.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,163.13 : 18,221.09 = 7,990.47 : x
  2. Step 2: Convert to fraction form
    12,163.13/18,221.09 = 7,990.47/x
  3. Step 3: Cross multiply
    12,163.13x = 18,221.09 × 7,990.47
  4. Step 4: Simplify right side
    12,163.13x = 145,595,033.06
  5. Step 5: Solve for x
    x = 145,595,033.06/12,163.13
  6. Step 6: Final answer
    x = 11,970.20

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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.