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Finding the Fourth Proportional to 1,981.13, 2,971.97 and 682.25

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Solution

The fourth proportional to 1,981.13, 2,971.97 and 682.25 is: 1,023.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.13 : 2,971.97 = 682.25 : x
  2. Step 2: Convert to fraction form
    1,981.13/2,971.97 = 682.25/x
  3. Step 3: Cross multiply
    1,981.13x = 2,971.97 × 682.25
  4. Step 4: Simplify right side
    1,981.13x = 2,027,626.53
  5. Step 5: Solve for x
    x = 2,027,626.53/1,981.13
  6. Step 6: Final answer
    x = 1,023.47

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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.