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Finding the Third Proportional to 4,991 and 7,638.50

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Solution

The third proportional to 4,991 and 7,638.50 is: 11,690.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,991 : 7,638.50 = 7,638.50 : x
  2. Step 2: Convert to fraction form
    4,991/7,638.50 = 7,638.50/x
  3. Step 3: Cross multiply
    4,991x = 7,638.50 × 7,638.50
  4. Step 4: Simplify right side
    4,991x = 58,346,682.25
  5. Step 5: Solve for x
    x = 58,346,682.25/4,991
  6. Step 6: Final answer
    x = 11,690.38

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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.