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Finding the Third Proportional to 1,931 and 3,111

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Solution

The third proportional to 1,931 and 3,111 is: 5,012.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,931 : 3,111 = 3,111 : x
  2. Step 2: Convert to fraction form
    1,931/3,111 = 3,111/x
  3. Step 3: Cross multiply
    1,931x = 3,111 × 3,111
  4. Step 4: Simplify right side
    1,931x = 9,678,321
  5. Step 5: Solve for x
    x = 9,678,321/1,931
  6. Step 6: Final answer
    x = 5,012.08

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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.