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Finding the Fourth Proportional to 20,606.80, 30,912.36 and 8,921.20

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Solution

The fourth proportional to 20,606.80, 30,912.36 and 8,921.20 is: 13,382.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,606.80 : 30,912.36 = 8,921.20 : x
  2. Step 2: Convert to fraction form
    20,606.80/30,912.36 = 8,921.20/x
  3. Step 3: Cross multiply
    20,606.80x = 30,912.36 × 8,921.20
  4. Step 4: Simplify right side
    20,606.80x = 275,775,346.03
  5. Step 5: Solve for x
    x = 275,775,346.03/20,606.80
  6. Step 6: Final answer
    x = 13,382.74

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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.