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Finding the Fourth Proportional to 13,954.80, 20,980.80 and 11,816.40

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Solution

The fourth proportional to 13,954.80, 20,980.80 and 11,816.40 is: 17,765.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,954.80 : 20,980.80 = 11,816.40 : x
  2. Step 2: Convert to fraction form
    13,954.80/20,980.80 = 11,816.40/x
  3. Step 3: Cross multiply
    13,954.80x = 20,980.80 × 11,816.40
  4. Step 4: Simplify right side
    13,954.80x = 247,917,525.12
  5. Step 5: Solve for x
    x = 247,917,525.12/13,954.80
  6. Step 6: Final answer
    x = 17,765.75

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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.