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Finding the Fourth Proportional to 13,800.80, 20,684.99 and 6,389.60

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Solution

The fourth proportional to 13,800.80, 20,684.99 and 6,389.60 is: 9,576.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,800.80 : 20,684.99 = 6,389.60 : x
  2. Step 2: Convert to fraction form
    13,800.80/20,684.99 = 6,389.60/x
  3. Step 3: Cross multiply
    13,800.80x = 20,684.99 × 6,389.60
  4. Step 4: Simplify right side
    13,800.80x = 132,168,676.73
  5. Step 5: Solve for x
    x = 132,168,676.73/13,800.80
  6. Step 6: Final answer
    x = 9,576.89

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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.