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Finding the Fourth Proportional to 1,981.80, 2,969.28 and 1,900.80

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Solution

The fourth proportional to 1,981.80, 2,969.28 and 1,900.80 is: 2,847.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.80 : 2,969.28 = 1,900.80 : x
  2. Step 2: Convert to fraction form
    1,981.80/2,969.28 = 1,900.80/x
  3. Step 3: Cross multiply
    1,981.80x = 2,969.28 × 1,900.80
  4. Step 4: Simplify right side
    1,981.80x = 5,644,007.42
  5. Step 5: Solve for x
    x = 5,644,007.42/1,981.80
  6. Step 6: Final answer
    x = 2,847.92

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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.