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Finding the Fourth Proportional to 1,912.80, 2,866.80 and 1,089.84

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Solution

The fourth proportional to 1,912.80, 2,866.80 and 1,089.84 is: 1,633.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.80 : 2,866.80 = 1,089.84 : x
  2. Step 2: Convert to fraction form
    1,912.80/2,866.80 = 1,089.84/x
  3. Step 3: Cross multiply
    1,912.80x = 2,866.80 × 1,089.84
  4. Step 4: Simplify right side
    1,912.80x = 3,124,353.31
  5. Step 5: Solve for x
    x = 3,124,353.31/1,912.80
  6. Step 6: Final answer
    x = 1,633.39

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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.