Home / 2,820.09-3,889.84-1,980.84

Finding the Fourth Proportional to 2,820.09, 3,889.84 and 1,980.84

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Solution

The fourth proportional to 2,820.09, 3,889.84 and 1,980.84 is: 2,732.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,820.09 : 3,889.84 = 1,980.84 : x
  2. Step 2: Convert to fraction form
    2,820.09/3,889.84 = 1,980.84/x
  3. Step 3: Cross multiply
    2,820.09x = 3,889.84 × 1,980.84
  4. Step 4: Simplify right side
    2,820.09x = 7,705,150.67
  5. Step 5: Solve for x
    x = 7,705,150.67/2,820.09
  6. Step 6: Final answer
    x = 2,732.24

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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.