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Finding the Third Proportional to 7,642 and 12,270

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Solution

The third proportional to 7,642 and 12,270 is: 19,700.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,642 : 12,270 = 12,270 : x
  2. Step 2: Convert to fraction form
    7,642/12,270 = 12,270/x
  3. Step 3: Cross multiply
    7,642x = 12,270 × 12,270
  4. Step 4: Simplify right side
    7,642x = 150,552,900
  5. Step 5: Solve for x
    x = 150,552,900/7,642
  6. Step 6: Final answer
    x = 19,700.72

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.