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Finding the Fourth Proportional to 1,351.20, 2,020.62 and 982.20

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Solution

The fourth proportional to 1,351.20, 2,020.62 and 982.20 is: 1,468.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.20 : 2,020.62 = 982.20 : x
  2. Step 2: Convert to fraction form
    1,351.20/2,020.62 = 982.20/x
  3. Step 3: Cross multiply
    1,351.20x = 2,020.62 × 982.20
  4. Step 4: Simplify right side
    1,351.20x = 1,984,652.96
  5. Step 5: Solve for x
    x = 1,984,652.96/1,351.20
  6. Step 6: Final answer
    x = 1,468.81

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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.