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Finding the Fourth Proportional to 3,912.81, 5,865.54 and 1,313.93

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Solution

The fourth proportional to 3,912.81, 5,865.54 and 1,313.93 is: 1,969.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,912.81 : 5,865.54 = 1,313.93 : x
  2. Step 2: Convert to fraction form
    3,912.81/5,865.54 = 1,313.93/x
  3. Step 3: Cross multiply
    3,912.81x = 5,865.54 × 1,313.93
  4. Step 4: Simplify right side
    3,912.81x = 7,706,879.64
  5. Step 5: Solve for x
    x = 7,706,879.64/3,912.81
  6. Step 6: Final answer
    x = 1,969.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.