Home / 2,120.68-3,177.51-821.44

Finding the Fourth Proportional to 2,120.68, 3,177.51 and 821.44

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Solution

The fourth proportional to 2,120.68, 3,177.51 and 821.44 is: 1,230.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.68 : 3,177.51 = 821.44 : x
  2. Step 2: Convert to fraction form
    2,120.68/3,177.51 = 821.44/x
  3. Step 3: Cross multiply
    2,120.68x = 3,177.51 × 821.44
  4. Step 4: Simplify right side
    2,120.68x = 2,610,133.81
  5. Step 5: Solve for x
    x = 2,610,133.81/2,120.68
  6. Step 6: Final answer
    x = 1,230.80

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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.