Home / 2,138.78-3,218.65-1,771.54

Finding the Fourth Proportional to 2,138.78, 3,218.65 and 1,771.54

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Solution

The fourth proportional to 2,138.78, 3,218.65 and 1,771.54 is: 2,665.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.78 : 3,218.65 = 1,771.54 : x
  2. Step 2: Convert to fraction form
    2,138.78/3,218.65 = 1,771.54/x
  3. Step 3: Cross multiply
    2,138.78x = 3,218.65 × 1,771.54
  4. Step 4: Simplify right side
    2,138.78x = 5,701,954.75
  5. Step 5: Solve for x
    x = 5,701,954.75/2,138.78
  6. Step 6: Final answer
    x = 2,665.98

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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.