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Finding the Fourth Proportional to 1,912.85, 2,869.04 and 859.44

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Solution

The fourth proportional to 1,912.85, 2,869.04 and 859.44 is: 1,289.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.85 : 2,869.04 = 859.44 : x
  2. Step 2: Convert to fraction form
    1,912.85/2,869.04 = 859.44/x
  3. Step 3: Cross multiply
    1,912.85x = 2,869.04 × 859.44
  4. Step 4: Simplify right side
    1,912.85x = 2,465,763.44
  5. Step 5: Solve for x
    x = 2,465,763.44/1,912.85
  6. Step 6: Final answer
    x = 1,289.06

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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.