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Finding the Fourth Proportional to 12,685.80, 18,999.90 and 8,020.20

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Solution

The fourth proportional to 12,685.80, 18,999.90 and 8,020.20 is: 12,012.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,685.80 : 18,999.90 = 8,020.20 : x
  2. Step 2: Convert to fraction form
    12,685.80/18,999.90 = 8,020.20/x
  3. Step 3: Cross multiply
    12,685.80x = 18,999.90 × 8,020.20
  4. Step 4: Simplify right side
    12,685.80x = 152,382,997.98
  5. Step 5: Solve for x
    x = 152,382,997.98/12,685.80
  6. Step 6: Final answer
    x = 12,012.09

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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.