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Finding the Fourth Proportional to 1,292.68, 1,940.20 and 676.80

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Solution

The fourth proportional to 1,292.68, 1,940.20 and 676.80 is: 1,015.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.68 : 1,940.20 = 676.80 : x
  2. Step 2: Convert to fraction form
    1,292.68/1,940.20 = 676.80/x
  3. Step 3: Cross multiply
    1,292.68x = 1,940.20 × 676.80
  4. Step 4: Simplify right side
    1,292.68x = 1,313,127.36
  5. Step 5: Solve for x
    x = 1,313,127.36/1,292.68
  6. Step 6: Final answer
    x = 1,015.82

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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.