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Finding the Fourth Proportional to 1,289.40, 1,936.84 and 1,094.80

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Solution

The fourth proportional to 1,289.40, 1,936.84 and 1,094.80 is: 1,644.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.40 : 1,936.84 = 1,094.80 : x
  2. Step 2: Convert to fraction form
    1,289.40/1,936.84 = 1,094.80/x
  3. Step 3: Cross multiply
    1,289.40x = 1,936.84 × 1,094.80
  4. Step 4: Simplify right side
    1,289.40x = 2,120,452.43
  5. Step 5: Solve for x
    x = 2,120,452.43/1,289.40
  6. Step 6: Final answer
    x = 1,644.53

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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.