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Finding the Fourth Proportional to 13,928.15, 20,921.39 and 11,741.15

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Solution

The fourth proportional to 13,928.15, 20,921.39 and 11,741.15 is: 17,636.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,928.15 : 20,921.39 = 11,741.15 : x
  2. Step 2: Convert to fraction form
    13,928.15/20,921.39 = 11,741.15/x
  3. Step 3: Cross multiply
    13,928.15x = 20,921.39 × 11,741.15
  4. Step 4: Simplify right side
    13,928.15x = 245,641,178.20
  5. Step 5: Solve for x
    x = 245,641,178.20/13,928.15
  6. Step 6: Final answer
    x = 17,636.31

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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.