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Finding the Third Proportional to 3,139 and 4,815

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Solution

The third proportional to 3,139 and 4,815 is: 7,385.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139 : 4,815 = 4,815 : x
  2. Step 2: Convert to fraction form
    3,139/4,815 = 4,815/x
  3. Step 3: Cross multiply
    3,139x = 4,815 × 4,815
  4. Step 4: Simplify right side
    3,139x = 23,184,225
  5. Step 5: Solve for x
    x = 23,184,225/3,139
  6. Step 6: Final answer
    x = 7,385.86

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.