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Finding the Third Proportional to 4,287 and 8,209.50

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Solution

The third proportional to 4,287 and 8,209.50 is: 15,720.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,287 : 8,209.50 = 8,209.50 : x
  2. Step 2: Convert to fraction form
    4,287/8,209.50 = 8,209.50/x
  3. Step 3: Cross multiply
    4,287x = 8,209.50 × 8,209.50
  4. Step 4: Simplify right side
    4,287x = 67,395,890.25
  5. Step 5: Solve for x
    x = 67,395,890.25/4,287
  6. Step 6: Final answer
    x = 15,720.99

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Why These Related Problems?

These problems maintain the same ratio (1.91) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.