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Finding the Fourth Proportional to 2,556.80, 3,835.20 and 1,908.80

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Solution

The fourth proportional to 2,556.80, 3,835.20 and 1,908.80 is: 2,863.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,556.80 : 3,835.20 = 1,908.80 : x
  2. Step 2: Convert to fraction form
    2,556.80/3,835.20 = 1,908.80/x
  3. Step 3: Cross multiply
    2,556.80x = 3,835.20 × 1,908.80
  4. Step 4: Simplify right side
    2,556.80x = 7,320,629.76
  5. Step 5: Solve for x
    x = 7,320,629.76/2,556.80
  6. Step 6: Final answer
    x = 2,863.20

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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.