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Finding the Fourth Proportional to 13,823.80, 19,071.40 and 8,509.38

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Solution

The fourth proportional to 13,823.80, 19,071.40 and 8,509.38 is: 11,739.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,823.80 : 19,071.40 = 8,509.38 : x
  2. Step 2: Convert to fraction form
    13,823.80/19,071.40 = 8,509.38/x
  3. Step 3: Cross multiply
    13,823.80x = 19,071.40 × 8,509.38
  4. Step 4: Simplify right side
    13,823.80x = 162,285,789.73
  5. Step 5: Solve for x
    x = 162,285,789.73/13,823.80
  6. Step 6: Final answer
    x = 11,739.59

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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.