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Finding the Fourth Proportional to 20,209.80, 30,309.30 and 7,060.80

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Solution

The fourth proportional to 20,209.80, 30,309.30 and 7,060.80 is: 10,589.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,209.80 : 30,309.30 = 7,060.80 : x
  2. Step 2: Convert to fraction form
    20,209.80/30,309.30 = 7,060.80/x
  3. Step 3: Cross multiply
    20,209.80x = 30,309.30 × 7,060.80
  4. Step 4: Simplify right side
    20,209.80x = 214,007,905.44
  5. Step 5: Solve for x
    x = 214,007,905.44/20,209.80
  6. Step 6: Final answer
    x = 10,589.31

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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.