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Finding the Fourth Proportional to 3,911.68, 5,868.36 and 1,313.92

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Solution

The fourth proportional to 3,911.68, 5,868.36 and 1,313.92 is: 1,971.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.68 : 5,868.36 = 1,313.92 : x
  2. Step 2: Convert to fraction form
    3,911.68/5,868.36 = 1,313.92/x
  3. Step 3: Cross multiply
    3,911.68x = 5,868.36 × 1,313.92
  4. Step 4: Simplify right side
    3,911.68x = 7,710,555.57
  5. Step 5: Solve for x
    x = 7,710,555.57/3,911.68
  6. Step 6: Final answer
    x = 1,971.16

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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.