Home / 2,856.21-3,940.70-1,861.13

Finding the Fourth Proportional to 2,856.21, 3,940.70 and 1,861.13

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Solution

The fourth proportional to 2,856.21, 3,940.70 and 1,861.13 is: 2,567.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,856.21 : 3,940.70 = 1,861.13 : x
  2. Step 2: Convert to fraction form
    2,856.21/3,940.70 = 1,861.13/x
  3. Step 3: Cross multiply
    2,856.21x = 3,940.70 × 1,861.13
  4. Step 4: Simplify right side
    2,856.21x = 7,334,125.98
  5. Step 5: Solve for x
    x = 7,334,125.98/2,856.21
  6. Step 6: Final answer
    x = 2,567.78

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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.