Home / 2,678.35-4,015.22-1,289.78

Finding the Fourth Proportional to 2,678.35, 4,015.22 and 1,289.78

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Solution

The fourth proportional to 2,678.35, 4,015.22 and 1,289.78 is: 1,933.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,678.35 : 4,015.22 = 1,289.78 : x
  2. Step 2: Convert to fraction form
    2,678.35/4,015.22 = 1,289.78/x
  3. Step 3: Cross multiply
    2,678.35x = 4,015.22 × 1,289.78
  4. Step 4: Simplify right side
    2,678.35x = 5,178,750.45
  5. Step 5: Solve for x
    x = 5,178,750.45/2,678.35
  6. Step 6: Final answer
    x = 1,933.56

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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.