Home / 12,940.80-19,399.70-7,662.84

Finding the Fourth Proportional to 12,940.80, 19,399.70 and 7,662.84

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Solution

The fourth proportional to 12,940.80, 19,399.70 and 7,662.84 is: 11,487.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,940.80 : 19,399.70 = 7,662.84 : x
  2. Step 2: Convert to fraction form
    12,940.80/19,399.70 = 7,662.84/x
  3. Step 3: Cross multiply
    12,940.80x = 19,399.70 × 7,662.84
  4. Step 4: Simplify right side
    12,940.80x = 148,656,797.15
  5. Step 5: Solve for x
    x = 148,656,797.15/12,940.80
  6. Step 6: Final answer
    x = 11,487.45

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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.