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Finding the Fourth Proportional to 13,958.15, 20,940.64 and 6,941.48

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Solution

The fourth proportional to 13,958.15, 20,940.64 and 6,941.48 is: 10,413.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,958.15 : 20,940.64 = 6,941.48 : x
  2. Step 2: Convert to fraction form
    13,958.15/20,940.64 = 6,941.48/x
  3. Step 3: Cross multiply
    13,958.15x = 20,940.64 × 6,941.48
  4. Step 4: Simplify right side
    13,958.15x = 145,358,911.69
  5. Step 5: Solve for x
    x = 145,358,911.69/13,958.15
  6. Step 6: Final answer
    x = 10,413.91

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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.