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Finding the Third Proportional to 859 and 2,136.50

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Solution

The third proportional to 859 and 2,136.50 is: 5,313.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    859 : 2,136.50 = 2,136.50 : x
  2. Step 2: Convert to fraction form
    859/2,136.50 = 2,136.50/x
  3. Step 3: Cross multiply
    859x = 2,136.50 × 2,136.50
  4. Step 4: Simplify right side
    859x = 4,564,632.25
  5. Step 5: Solve for x
    x = 4,564,632.25/859
  6. Step 6: Final answer
    x = 5,313.89

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Why These Related Problems?

These problems maintain the same ratio (2.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.