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Finding the Fourth Proportional to 13,780.40, 20,670.60 and 9,163.40

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Solution

The fourth proportional to 13,780.40, 20,670.60 and 9,163.40 is: 13,745.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,780.40 : 20,670.60 = 9,163.40 : x
  2. Step 2: Convert to fraction form
    13,780.40/20,670.60 = 9,163.40/x
  3. Step 3: Cross multiply
    13,780.40x = 20,670.60 × 9,163.40
  4. Step 4: Simplify right side
    13,780.40x = 189,412,976.04
  5. Step 5: Solve for x
    x = 189,412,976.04/13,780.40
  6. Step 6: Final answer
    x = 13,745.10

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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.