Home / 2,858.20-3,940.86-1,972.60

Finding the Fourth Proportional to 2,858.20, 3,940.86 and 1,972.60

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Solution

The fourth proportional to 2,858.20, 3,940.86 and 1,972.60 is: 2,719.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,858.20 : 3,940.86 = 1,972.60 : x
  2. Step 2: Convert to fraction form
    2,858.20/3,940.86 = 1,972.60/x
  3. Step 3: Cross multiply
    2,858.20x = 3,940.86 × 1,972.60
  4. Step 4: Simplify right side
    2,858.20x = 7,773,740.44
  5. Step 5: Solve for x
    x = 7,773,740.44/2,858.20
  6. Step 6: Final answer
    x = 2,719.80

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1.5x scale

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.