Home / 2,119.62-3,179.40-821.34

Finding the Fourth Proportional to 2,119.62, 3,179.40 and 821.34

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Solution

The fourth proportional to 2,119.62, 3,179.40 and 821.34 is: 1,232.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,119.62 : 3,179.40 = 821.34 : x
  2. Step 2: Convert to fraction form
    2,119.62/3,179.40 = 821.34/x
  3. Step 3: Cross multiply
    2,119.62x = 3,179.40 × 821.34
  4. Step 4: Simplify right side
    2,119.62x = 2,611,368.40
  5. Step 5: Solve for x
    x = 2,611,368.40/2,119.62
  6. Step 6: Final answer
    x = 1,232.00

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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.