Home / 2,811.86-4,215.90-1,979.60

Finding the Fourth Proportional to 2,811.86, 4,215.90 and 1,979.60

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Solution

The fourth proportional to 2,811.86, 4,215.90 and 1,979.60 is: 2,968.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.86 : 4,215.90 = 1,979.60 : x
  2. Step 2: Convert to fraction form
    2,811.86/4,215.90 = 1,979.60/x
  3. Step 3: Cross multiply
    2,811.86x = 4,215.90 × 1,979.60
  4. Step 4: Simplify right side
    2,811.86x = 8,345,774.56
  5. Step 5: Solve for x
    x = 8,345,774.56/2,811.86
  6. Step 6: Final answer
    x = 2,968.07

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1.5x scale

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.