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Finding the Third Proportional to 3,129.75 and 4,779

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Solution

The third proportional to 3,129.75 and 4,779 is: 7,297.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.75 : 4,779 = 4,779 : x
  2. Step 2: Convert to fraction form
    3,129.75/4,779 = 4,779/x
  3. Step 3: Cross multiply
    3,129.75x = 4,779 × 4,779
  4. Step 4: Simplify right side
    3,129.75x = 22,838,841
  5. Step 5: Solve for x
    x = 22,838,841/3,129.75
  6. Step 6: Final answer
    x = 7,297.34

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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.