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Finding the Fourth Proportional to 789.14, 1,089 and 439.82

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Solution

The fourth proportional to 789.14, 1,089 and 439.82 is: 606.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.14 : 1,089 = 439.82 : x
  2. Step 2: Convert to fraction form
    789.14/1,089 = 439.82/x
  3. Step 3: Cross multiply
    789.14x = 1,089 × 439.82
  4. Step 4: Simplify right side
    789.14x = 478,963.98
  5. Step 5: Solve for x
    x = 478,963.98/789.14
  6. Step 6: Final answer
    x = 606.94

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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.