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Finding the Third Proportional to 5,307 and 7,978

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Solution

The third proportional to 5,307 and 7,978 is: 11,993.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,307 : 7,978 = 7,978 : x
  2. Step 2: Convert to fraction form
    5,307/7,978 = 7,978/x
  3. Step 3: Cross multiply
    5,307x = 7,978 × 7,978
  4. Step 4: Simplify right side
    5,307x = 63,648,484
  5. Step 5: Solve for x
    x = 63,648,484/5,307
  6. Step 6: Final answer
    x = 11,993.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.