Home / 12,939.20-19,423.20-7,092.80

Finding the Fourth Proportional to 12,939.20, 19,423.20 and 7,092.80

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Solution

The fourth proportional to 12,939.20, 19,423.20 and 7,092.80 is: 10,647.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.20 : 19,423.20 = 7,092.80 : x
  2. Step 2: Convert to fraction form
    12,939.20/19,423.20 = 7,092.80/x
  3. Step 3: Cross multiply
    12,939.20x = 19,423.20 × 7,092.80
  4. Step 4: Simplify right side
    12,939.20x = 137,764,872.96
  5. Step 5: Solve for x
    x = 137,764,872.96/12,939.20
  6. Step 6: Final answer
    x = 10,647.09

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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.