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Finding the Third Proportional to 1,911 and 3,136.50

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Solution

The third proportional to 1,911 and 3,136.50 is: 5,147.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911 : 3,136.50 = 3,136.50 : x
  2. Step 2: Convert to fraction form
    1,911/3,136.50 = 3,136.50/x
  3. Step 3: Cross multiply
    1,911x = 3,136.50 × 3,136.50
  4. Step 4: Simplify right side
    1,911x = 9,837,632.25
  5. Step 5: Solve for x
    x = 9,837,632.25/1,911
  6. Step 6: Final answer
    x = 5,147.90

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.