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Finding the Third Proportional to 3,907.50 and 7,221

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Solution

The third proportional to 3,907.50 and 7,221 is: 13,344.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,907.50 : 7,221 = 7,221 : x
  2. Step 2: Convert to fraction form
    3,907.50/7,221 = 7,221/x
  3. Step 3: Cross multiply
    3,907.50x = 7,221 × 7,221
  4. Step 4: Simplify right side
    3,907.50x = 52,142,841
  5. Step 5: Solve for x
    x = 52,142,841/3,907.50
  6. Step 6: Final answer
    x = 13,344.30

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Why These Related Problems?

These problems maintain the same ratio (1.85) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.