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Finding the Fourth Proportional to 12,224, 18,336.16 and 2,990

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Solution

The fourth proportional to 12,224, 18,336.16 and 2,990 is: 4,485.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,224 : 18,336.16 = 2,990 : x
  2. Step 2: Convert to fraction form
    12,224/18,336.16 = 2,990/x
  3. Step 3: Cross multiply
    12,224x = 18,336.16 × 2,990
  4. Step 4: Simplify right side
    12,224x = 54,825,118.40
  5. Step 5: Solve for x
    x = 54,825,118.40/12,224
  6. Step 6: Final answer
    x = 4,485.04

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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.