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Finding the Fourth Proportional to 13,091, 19,636.50 and 3,857

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Solution

The fourth proportional to 13,091, 19,636.50 and 3,857 is: 5,785.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,091 : 19,636.50 = 3,857 : x
  2. Step 2: Convert to fraction form
    13,091/19,636.50 = 3,857/x
  3. Step 3: Cross multiply
    13,091x = 19,636.50 × 3,857
  4. Step 4: Simplify right side
    13,091x = 75,737,980.50
  5. Step 5: Solve for x
    x = 75,737,980.50/13,091
  6. Step 6: Final answer
    x = 5,785.50

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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.