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Finding the Fourth Proportional to 1,418.97, 1,958.25 and 789.51

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Solution

The fourth proportional to 1,418.97, 1,958.25 and 789.51 is: 1,089.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.97 : 1,958.25 = 789.51 : x
  2. Step 2: Convert to fraction form
    1,418.97/1,958.25 = 789.51/x
  3. Step 3: Cross multiply
    1,418.97x = 1,958.25 × 789.51
  4. Step 4: Simplify right side
    1,418.97x = 1,546,057.96
  5. Step 5: Solve for x
    x = 1,546,057.96/1,418.97
  6. Step 6: Final answer
    x = 1,089.56

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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.