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Finding the Fourth Proportional to 1,960.70, 2,940.39 and 790.40

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Solution

The fourth proportional to 1,960.70, 2,940.39 and 790.40 is: 1,185.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,960.70 : 2,940.39 = 790.40 : x
  2. Step 2: Convert to fraction form
    1,960.70/2,940.39 = 790.40/x
  3. Step 3: Cross multiply
    1,960.70x = 2,940.39 × 790.40
  4. Step 4: Simplify right side
    1,960.70x = 2,324,069.55
  5. Step 5: Solve for x
    x = 2,324,069.55/1,960.70
  6. Step 6: Final answer
    x = 1,185.33

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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.