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Finding the Third Proportional to 4,990 and 7,911

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Solution

The third proportional to 4,990 and 7,911 is: 12,541.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,990 : 7,911 = 7,911 : x
  2. Step 2: Convert to fraction form
    4,990/7,911 = 7,911/x
  3. Step 3: Cross multiply
    4,990x = 7,911 × 7,911
  4. Step 4: Simplify right side
    4,990x = 62,583,921
  5. Step 5: Solve for x
    x = 62,583,921/4,990
  6. Step 6: Final answer
    x = 12,541.87

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.