Home / 3,319.80-4,979.40-1,128.60

Finding the Fourth Proportional to 3,319.80, 4,979.40 and 1,128.60

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Solution

The fourth proportional to 3,319.80, 4,979.40 and 1,128.60 is: 1,692.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,319.80 : 4,979.40 = 1,128.60 : x
  2. Step 2: Convert to fraction form
    3,319.80/4,979.40 = 1,128.60/x
  3. Step 3: Cross multiply
    3,319.80x = 4,979.40 × 1,128.60
  4. Step 4: Simplify right side
    3,319.80x = 5,619,750.84
  5. Step 5: Solve for x
    x = 5,619,750.84/3,319.80
  6. Step 6: Final answer
    x = 1,692.80

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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.