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Finding the Fourth Proportional to 1,911.28, 2,868 and 757.12

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Solution

The fourth proportional to 1,911.28, 2,868 and 757.12 is: 1,136.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.28 : 2,868 = 757.12 : x
  2. Step 2: Convert to fraction form
    1,911.28/2,868 = 757.12/x
  3. Step 3: Cross multiply
    1,911.28x = 2,868 × 757.12
  4. Step 4: Simplify right side
    1,911.28x = 2,171,420.16
  5. Step 5: Solve for x
    x = 2,171,420.16/1,911.28
  6. Step 6: Final answer
    x = 1,136.11

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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.