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Finding the Third Proportional to 1,915 and 4,139

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Solution

The third proportional to 1,915 and 4,139 is: 8,945.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915 : 4,139 = 4,139 : x
  2. Step 2: Convert to fraction form
    1,915/4,139 = 4,139/x
  3. Step 3: Cross multiply
    1,915x = 4,139 × 4,139
  4. Step 4: Simplify right side
    1,915x = 17,131,321
  5. Step 5: Solve for x
    x = 17,131,321/1,915
  6. Step 6: Final answer
    x = 8,945.86

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.