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Finding the Fourth Proportional to 1,980.72, 2,971.80 and 682.20

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Solution

The fourth proportional to 1,980.72, 2,971.80 and 682.20 is: 1,023.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.72 : 2,971.80 = 682.20 : x
  2. Step 2: Convert to fraction form
    1,980.72/2,971.80 = 682.20/x
  3. Step 3: Cross multiply
    1,980.72x = 2,971.80 × 682.20
  4. Step 4: Simplify right side
    1,980.72x = 2,027,361.96
  5. Step 5: Solve for x
    x = 2,027,361.96/1,980.72
  6. Step 6: Final answer
    x = 1,023.55

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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.