Home / 1,328.21-1,990.60-1,107.46

Finding the Fourth Proportional to 1,328.21, 1,990.60 and 1,107.46

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Solution

The fourth proportional to 1,328.21, 1,990.60 and 1,107.46 is: 1,659.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.21 : 1,990.60 = 1,107.46 : x
  2. Step 2: Convert to fraction form
    1,328.21/1,990.60 = 1,107.46/x
  3. Step 3: Cross multiply
    1,328.21x = 1,990.60 × 1,107.46
  4. Step 4: Simplify right side
    1,328.21x = 2,204,509.60
  5. Step 5: Solve for x
    x = 2,204,509.60/1,328.21
  6. Step 6: Final answer
    x = 1,659.76

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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.