Home / 2,219.80-3,323.30-1,989.40

Finding the Fourth Proportional to 2,219.80, 3,323.30 and 1,989.40

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Solution

The fourth proportional to 2,219.80, 3,323.30 and 1,989.40 is: 2,978.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,219.80 : 3,323.30 = 1,989.40 : x
  2. Step 2: Convert to fraction form
    2,219.80/3,323.30 = 1,989.40/x
  3. Step 3: Cross multiply
    2,219.80x = 3,323.30 × 1,989.40
  4. Step 4: Simplify right side
    2,219.80x = 6,611,373.02
  5. Step 5: Solve for x
    x = 6,611,373.02/2,219.80
  6. Step 6: Final answer
    x = 2,978.36

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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.