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Finding the Fourth Proportional to 13,986.86, 20,980.30 and 13,379.46

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Solution

The fourth proportional to 13,986.86, 20,980.30 and 13,379.46 is: 20,069.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,986.86 : 20,980.30 = 13,379.46 : x
  2. Step 2: Convert to fraction form
    13,986.86/20,980.30 = 13,379.46/x
  3. Step 3: Cross multiply
    13,986.86x = 20,980.30 × 13,379.46
  4. Step 4: Simplify right side
    13,986.86x = 280,705,043.14
  5. Step 5: Solve for x
    x = 280,705,043.14/13,986.86
  6. Step 6: Final answer
    x = 20,069.19

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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.