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Finding the Third Proportional to 8,472 and 12,430

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Solution

The third proportional to 8,472 and 12,430 is: 18,237.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,472 : 12,430 = 12,430 : x
  2. Step 2: Convert to fraction form
    8,472/12,430 = 12,430/x
  3. Step 3: Cross multiply
    8,472x = 12,430 × 12,430
  4. Step 4: Simplify right side
    8,472x = 154,504,900
  5. Step 5: Solve for x
    x = 154,504,900/8,472
  6. Step 6: Final answer
    x = 18,237.12

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.