Home / 2,980.40-4,480.20-2,807.60

Finding the Fourth Proportional to 2,980.40, 4,480.20 and 2,807.60

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Solution

The fourth proportional to 2,980.40, 4,480.20 and 2,807.60 is: 4,220.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,980.40 : 4,480.20 = 2,807.60 : x
  2. Step 2: Convert to fraction form
    2,980.40/4,480.20 = 2,807.60/x
  3. Step 3: Cross multiply
    2,980.40x = 4,480.20 × 2,807.60
  4. Step 4: Simplify right side
    2,980.40x = 12,578,609.52
  5. Step 5: Solve for x
    x = 12,578,609.52/2,980.40
  6. Step 6: Final answer
    x = 4,220.44

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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.