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Finding the Fourth Proportional to 20,407.80, 30,611.70 and 7,260.60

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Solution

The fourth proportional to 20,407.80, 30,611.70 and 7,260.60 is: 10,890.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,407.80 : 30,611.70 = 7,260.60 : x
  2. Step 2: Convert to fraction form
    20,407.80/30,611.70 = 7,260.60/x
  3. Step 3: Cross multiply
    20,407.80x = 30,611.70 × 7,260.60
  4. Step 4: Simplify right side
    20,407.80x = 222,259,309.02
  5. Step 5: Solve for x
    x = 222,259,309.02/20,407.80
  6. Step 6: Final answer
    x = 10,890.90

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Similar ratio
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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.