Home / 1,981.92-2,972.88-1,211.36

Finding the Fourth Proportional to 1,981.92, 2,972.88 and 1,211.36

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Solution

The fourth proportional to 1,981.92, 2,972.88 and 1,211.36 is: 1,817.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.92 : 2,972.88 = 1,211.36 : x
  2. Step 2: Convert to fraction form
    1,981.92/2,972.88 = 1,211.36/x
  3. Step 3: Cross multiply
    1,981.92x = 2,972.88 × 1,211.36
  4. Step 4: Simplify right side
    1,981.92x = 3,601,227.92
  5. Step 5: Solve for x
    x = 3,601,227.92/1,981.92
  6. Step 6: Final answer
    x = 1,817.04

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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.