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Finding the Fourth Proportional to 3,376.88, 5,065.40 and 911.92

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Solution

The fourth proportional to 3,376.88, 5,065.40 and 911.92 is: 1,367.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,376.88 : 5,065.40 = 911.92 : x
  2. Step 2: Convert to fraction form
    3,376.88/5,065.40 = 911.92/x
  3. Step 3: Cross multiply
    3,376.88x = 5,065.40 × 911.92
  4. Step 4: Simplify right side
    3,376.88x = 4,619,239.57
  5. Step 5: Solve for x
    x = 4,619,239.57/3,376.88
  6. Step 6: Final answer
    x = 1,367.90

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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.