Home / 13,629.20-18,811.85-7,662.78

Finding the Fourth Proportional to 13,629.20, 18,811.85 and 7,662.78

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Solution

The fourth proportional to 13,629.20, 18,811.85 and 7,662.78 is: 10,576.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,629.20 : 18,811.85 = 7,662.78 : x
  2. Step 2: Convert to fraction form
    13,629.20/18,811.85 = 7,662.78/x
  3. Step 3: Cross multiply
    13,629.20x = 18,811.85 × 7,662.78
  4. Step 4: Simplify right side
    13,629.20x = 144,151,029.63
  5. Step 5: Solve for x
    x = 144,151,029.63/13,629.20
  6. Step 6: Final answer
    x = 10,576.64

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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.