Home / 12,939.70-19,405.39-4,172.56

Finding the Fourth Proportional to 12,939.70, 19,405.39 and 4,172.56

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Solution

The fourth proportional to 12,939.70, 19,405.39 and 4,172.56 is: 6,257.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.70 : 19,405.39 = 4,172.56 : x
  2. Step 2: Convert to fraction form
    12,939.70/19,405.39 = 4,172.56/x
  3. Step 3: Cross multiply
    12,939.70x = 19,405.39 × 4,172.56
  4. Step 4: Simplify right side
    12,939.70x = 80,970,212.13
  5. Step 5: Solve for x
    x = 80,970,212.13/12,939.70
  6. Step 6: Final answer
    x = 6,257.50

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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.