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Finding the Fourth Proportional to 2,990.44, 4,480.80 and 2,120.50

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Solution

The fourth proportional to 2,990.44, 4,480.80 and 2,120.50 is: 3,177.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.44 : 4,480.80 = 2,120.50 : x
  2. Step 2: Convert to fraction form
    2,990.44/4,480.80 = 2,120.50/x
  3. Step 3: Cross multiply
    2,990.44x = 4,480.80 × 2,120.50
  4. Step 4: Simplify right side
    2,990.44x = 9,501,536.40
  5. Step 5: Solve for x
    x = 9,501,536.40/2,990.44
  6. Step 6: Final answer
    x = 3,177.30

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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.