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Finding the Fourth Proportional to 13,840.20, 20,760.30 and 13,235.40

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Solution

The fourth proportional to 13,840.20, 20,760.30 and 13,235.40 is: 19,853.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,840.20 : 20,760.30 = 13,235.40 : x
  2. Step 2: Convert to fraction form
    13,840.20/20,760.30 = 13,235.40/x
  3. Step 3: Cross multiply
    13,840.20x = 20,760.30 × 13,235.40
  4. Step 4: Simplify right side
    13,840.20x = 274,770,874.62
  5. Step 5: Solve for x
    x = 274,770,874.62/13,840.20
  6. Step 6: Final answer
    x = 19,853.10

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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.