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Finding the Fourth Proportional to 2,775.94, 3,830.79 and 1,728

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Solution

The fourth proportional to 2,775.94, 3,830.79 and 1,728 is: 2,384.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,775.94 : 3,830.79 = 1,728 : x
  2. Step 2: Convert to fraction form
    2,775.94/3,830.79 = 1,728/x
  3. Step 3: Cross multiply
    2,775.94x = 3,830.79 × 1,728
  4. Step 4: Simplify right side
    2,775.94x = 6,619,611.60
  5. Step 5: Solve for x
    x = 6,619,611.60/2,775.94
  6. Step 6: Final answer
    x = 2,384.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.