Home / 3,140.78-4,709.75-1,191.60

Finding the Fourth Proportional to 3,140.78, 4,709.75 and 1,191.60

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Solution

The fourth proportional to 3,140.78, 4,709.75 and 1,191.60 is: 1,786.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,140.78 : 4,709.75 = 1,191.60 : x
  2. Step 2: Convert to fraction form
    3,140.78/4,709.75 = 1,191.60/x
  3. Step 3: Cross multiply
    3,140.78x = 4,709.75 × 1,191.60
  4. Step 4: Simplify right side
    3,140.78x = 5,612,132.14
  5. Step 5: Solve for x
    x = 5,612,132.14/3,140.78
  6. Step 6: Final answer
    x = 1,786.86

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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.