Home / 12,163.50-18,221.63-7,990.83

Finding the Fourth Proportional to 12,163.50, 18,221.63 and 7,990.83

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Solution

The fourth proportional to 12,163.50, 18,221.63 and 7,990.83 is: 11,970.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,163.50 : 18,221.63 = 7,990.83 : x
  2. Step 2: Convert to fraction form
    12,163.50/18,221.63 = 7,990.83/x
  3. Step 3: Cross multiply
    12,163.50x = 18,221.63 × 7,990.83
  4. Step 4: Simplify right side
    12,163.50x = 145,605,907.70
  5. Step 5: Solve for x
    x = 145,605,907.70/12,163.50
  6. Step 6: Final answer
    x = 11,970.72

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Half scale
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Double scale
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Similar ratio
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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.