Home / 12,129.64-18,198.90-5,111.41

Finding the Fourth Proportional to 12,129.64, 18,198.90 and 5,111.41

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Solution

The fourth proportional to 12,129.64, 18,198.90 and 5,111.41 is: 7,668.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,129.64 : 18,198.90 = 5,111.41 : x
  2. Step 2: Convert to fraction form
    12,129.64/18,198.90 = 5,111.41/x
  3. Step 3: Cross multiply
    12,129.64x = 18,198.90 × 5,111.41
  4. Step 4: Simplify right side
    12,129.64x = 93,022,039.45
  5. Step 5: Solve for x
    x = 93,022,039.45/12,129.64
  6. Step 6: Final answer
    x = 7,668.99

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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.