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Finding the Fourth Proportional to 2,119.81, 3,179.71 and 821.27

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Solution

The fourth proportional to 2,119.81, 3,179.71 and 821.27 is: 1,231.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,119.81 : 3,179.71 = 821.27 : x
  2. Step 2: Convert to fraction form
    2,119.81/3,179.71 = 821.27/x
  3. Step 3: Cross multiply
    2,119.81x = 3,179.71 × 821.27
  4. Step 4: Simplify right side
    2,119.81x = 2,611,406.33
  5. Step 5: Solve for x
    x = 2,611,406.33/2,119.81
  6. Step 6: Final answer
    x = 1,231.91

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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.