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Finding the Fourth Proportional to 1,286.96, 1,775.44 and 789.57

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Solution

The fourth proportional to 1,286.96, 1,775.44 and 789.57 is: 1,089.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.96 : 1,775.44 = 789.57 : x
  2. Step 2: Convert to fraction form
    1,286.96/1,775.44 = 789.57/x
  3. Step 3: Cross multiply
    1,286.96x = 1,775.44 × 789.57
  4. Step 4: Simplify right side
    1,286.96x = 1,401,834.16
  5. Step 5: Solve for x
    x = 1,401,834.16/1,286.96
  6. Step 6: Final answer
    x = 1,089.26

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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.