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Finding the Fourth Proportional to 1,418.73, 1,957.77 and 789.18

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Solution

The fourth proportional to 1,418.73, 1,957.77 and 789.18 is: 1,089.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.73 : 1,957.77 = 789.18 : x
  2. Step 2: Convert to fraction form
    1,418.73/1,957.77 = 789.18/x
  3. Step 3: Cross multiply
    1,418.73x = 1,957.77 × 789.18
  4. Step 4: Simplify right side
    1,418.73x = 1,545,032.93
  5. Step 5: Solve for x
    x = 1,545,032.93/1,418.73
  6. Step 6: Final answer
    x = 1,089.03

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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.