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Finding the Third Proportional to 7,200 and 11,820

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Solution

The third proportional to 7,200 and 11,820 is: 19,404.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,200 : 11,820 = 11,820 : x
  2. Step 2: Convert to fraction form
    7,200/11,820 = 11,820/x
  3. Step 3: Cross multiply
    7,200x = 11,820 × 11,820
  4. Step 4: Simplify right side
    7,200x = 139,712,400
  5. Step 5: Solve for x
    x = 139,712,400/7,200
  6. Step 6: Final answer
    x = 19,404.50

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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.