Home / 2,120.70-3,165.68-1,861.50

Finding the Fourth Proportional to 2,120.70, 3,165.68 and 1,861.50

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Solution

The fourth proportional to 2,120.70, 3,165.68 and 1,861.50 is: 2,778.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.70 : 3,165.68 = 1,861.50 : x
  2. Step 2: Convert to fraction form
    2,120.70/3,165.68 = 1,861.50/x
  3. Step 3: Cross multiply
    2,120.70x = 3,165.68 × 1,861.50
  4. Step 4: Simplify right side
    2,120.70x = 5,892,904.01
  5. Step 5: Solve for x
    x = 5,892,904.01/2,120.70
  6. Step 6: Final answer
    x = 2,778.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.