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Finding the Fourth Proportional to 789.44, 1,089.36 and 490.60

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Solution

The fourth proportional to 789.44, 1,089.36 and 490.60 is: 676.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.44 : 1,089.36 = 490.60 : x
  2. Step 2: Convert to fraction form
    789.44/1,089.36 = 490.60/x
  3. Step 3: Cross multiply
    789.44x = 1,089.36 × 490.60
  4. Step 4: Simplify right side
    789.44x = 534,440.02
  5. Step 5: Solve for x
    x = 534,440.02/789.44
  6. Step 6: Final answer
    x = 676.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.