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Finding the Fourth Proportional to 13,980.48, 20,944.80 and 12,425.28

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Solution

The fourth proportional to 13,980.48, 20,944.80 and 12,425.28 is: 18,614.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,980.48 : 20,944.80 = 12,425.28 : x
  2. Step 2: Convert to fraction form
    13,980.48/20,944.80 = 12,425.28/x
  3. Step 3: Cross multiply
    13,980.48x = 20,944.80 × 12,425.28
  4. Step 4: Simplify right side
    13,980.48x = 260,245,004.54
  5. Step 5: Solve for x
    x = 260,245,004.54/13,980.48
  6. Step 6: Final answer
    x = 18,614.88

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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.