Home / 21,811.20-30,099.60-12,379.92

Finding the Fourth Proportional to 21,811.20, 30,099.60 and 12,379.92

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Solution

The fourth proportional to 21,811.20, 30,099.60 and 12,379.92 is: 17,084.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,811.20 : 30,099.60 = 12,379.92 : x
  2. Step 2: Convert to fraction form
    21,811.20/30,099.60 = 12,379.92/x
  3. Step 3: Cross multiply
    21,811.20x = 30,099.60 × 12,379.92
  4. Step 4: Simplify right side
    21,811.20x = 372,630,640.03
  5. Step 5: Solve for x
    x = 372,630,640.03/21,811.20
  6. Step 6: Final answer
    x = 17,084.37

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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.