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Finding the Fourth Proportional to 1,940.63, 2,910.20 and 1,209.78

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Solution

The fourth proportional to 1,940.63, 2,910.20 and 1,209.78 is: 1,814.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.63 : 2,910.20 = 1,209.78 : x
  2. Step 2: Convert to fraction form
    1,940.63/2,910.20 = 1,209.78/x
  3. Step 3: Cross multiply
    1,940.63x = 2,910.20 × 1,209.78
  4. Step 4: Simplify right side
    1,940.63x = 3,520,695.71
  5. Step 5: Solve for x
    x = 3,520,695.71/1,940.63
  6. Step 6: Final answer
    x = 1,814.21

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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.