Home / 1,313.26-1,812.63-789.60

Finding the Fourth Proportional to 1,313.26, 1,812.63 and 789.60

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Solution

The fourth proportional to 1,313.26, 1,812.63 and 789.60 is: 1,089.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.26 : 1,812.63 = 789.60 : x
  2. Step 2: Convert to fraction form
    1,313.26/1,812.63 = 789.60/x
  3. Step 3: Cross multiply
    1,313.26x = 1,812.63 × 789.60
  4. Step 4: Simplify right side
    1,313.26x = 1,431,252.65
  5. Step 5: Solve for x
    x = 1,431,252.65/1,313.26
  6. Step 6: Final answer
    x = 1,089.85

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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.