Home / 2,189.64-3,278.70-1,210.80

Finding the Fourth Proportional to 2,189.64, 3,278.70 and 1,210.80

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Solution

The fourth proportional to 2,189.64, 3,278.70 and 1,210.80 is: 1,813.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,189.64 : 3,278.70 = 1,210.80 : x
  2. Step 2: Convert to fraction form
    2,189.64/3,278.70 = 1,210.80/x
  3. Step 3: Cross multiply
    2,189.64x = 3,278.70 × 1,210.80
  4. Step 4: Simplify right side
    2,189.64x = 3,969,849.96
  5. Step 5: Solve for x
    x = 3,969,849.96/2,189.64
  6. Step 6: Final answer
    x = 1,813.01

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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.