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Finding the Fourth Proportional to 2,135.24, 3,201.72 and 980

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Solution

The fourth proportional to 2,135.24, 3,201.72 and 980 is: 1,469.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,135.24 : 3,201.72 = 980 : x
  2. Step 2: Convert to fraction form
    2,135.24/3,201.72 = 980/x
  3. Step 3: Cross multiply
    2,135.24x = 3,201.72 × 980
  4. Step 4: Simplify right side
    2,135.24x = 3,137,685.60
  5. Step 5: Solve for x
    x = 3,137,685.60/2,135.24
  6. Step 6: Final answer
    x = 1,469.48

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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.