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Finding the Fourth Proportional to 12,289.73, 18,436.68 and 3,968.73

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Solution

The fourth proportional to 12,289.73, 18,436.68 and 3,968.73 is: 5,953.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,289.73 : 18,436.68 = 3,968.73 : x
  2. Step 2: Convert to fraction form
    12,289.73/18,436.68 = 3,968.73/x
  3. Step 3: Cross multiply
    12,289.73x = 18,436.68 × 3,968.73
  4. Step 4: Simplify right side
    12,289.73x = 73,170,205.02
  5. Step 5: Solve for x
    x = 73,170,205.02/12,289.73
  6. Step 6: Final answer
    x = 5,953.77

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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.