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Finding the Fourth Proportional to 21,321.60, 32,020.80 and 20,630.40

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Solution

The fourth proportional to 21,321.60, 32,020.80 and 20,630.40 is: 30,982.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,321.60 : 32,020.80 = 20,630.40 : x
  2. Step 2: Convert to fraction form
    21,321.60/32,020.80 = 20,630.40/x
  3. Step 3: Cross multiply
    21,321.60x = 32,020.80 × 20,630.40
  4. Step 4: Simplify right side
    21,321.60x = 660,601,912.32
  5. Step 5: Solve for x
    x = 660,601,912.32/21,321.60
  6. Step 6: Final answer
    x = 30,982.76

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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.