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Finding the Fourth Proportional to 13,078.80, 18,045.09 and 8,359.20

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Solution

The fourth proportional to 13,078.80, 18,045.09 and 8,359.20 is: 11,533.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,078.80 : 18,045.09 = 8,359.20 : x
  2. Step 2: Convert to fraction form
    13,078.80/18,045.09 = 8,359.20/x
  3. Step 3: Cross multiply
    13,078.80x = 18,045.09 × 8,359.20
  4. Step 4: Simplify right side
    13,078.80x = 150,842,516.33
  5. Step 5: Solve for x
    x = 150,842,516.33/13,078.80
  6. Step 6: Final answer
    x = 11,533.36

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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.