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Finding the Fourth Proportional to 13,991.40, 20,990.12 and 6,975.20

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Solution

The fourth proportional to 13,991.40, 20,990.12 and 6,975.20 is: 10,464.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.40 : 20,990.12 = 6,975.20 : x
  2. Step 2: Convert to fraction form
    13,991.40/20,990.12 = 6,975.20/x
  3. Step 3: Cross multiply
    13,991.40x = 20,990.12 × 6,975.20
  4. Step 4: Simplify right side
    13,991.40x = 146,410,285.02
  5. Step 5: Solve for x
    x = 146,410,285.02/13,991.40
  6. Step 6: Final answer
    x = 10,464.31

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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.