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Finding the Fourth Proportional to 20,387.40, 30,600.30 and 12,611.40

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Solution

The fourth proportional to 20,387.40, 30,600.30 and 12,611.40 is: 18,928.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.40 : 30,600.30 = 12,611.40 : x
  2. Step 2: Convert to fraction form
    20,387.40/30,600.30 = 12,611.40/x
  3. Step 3: Cross multiply
    20,387.40x = 30,600.30 × 12,611.40
  4. Step 4: Simplify right side
    20,387.40x = 385,912,623.42
  5. Step 5: Solve for x
    x = 385,912,623.42/20,387.40
  6. Step 6: Final answer
    x = 18,928.98

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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.