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Finding the Fourth Proportional to 3,102.67, 4,653.80 and 911.21

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Solution

The fourth proportional to 3,102.67, 4,653.80 and 911.21 is: 1,366.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,102.67 : 4,653.80 = 911.21 : x
  2. Step 2: Convert to fraction form
    3,102.67/4,653.80 = 911.21/x
  3. Step 3: Cross multiply
    3,102.67x = 4,653.80 × 911.21
  4. Step 4: Simplify right side
    3,102.67x = 4,240,589.10
  5. Step 5: Solve for x
    x = 4,240,589.10/3,102.67
  6. Step 6: Final answer
    x = 1,366.75

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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.