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Finding the Third Proportional to 6,429 and 7,779

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Solution

The third proportional to 6,429 and 7,779 is: 9,412.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,429 : 7,779 = 7,779 : x
  2. Step 2: Convert to fraction form
    6,429/7,779 = 7,779/x
  3. Step 3: Cross multiply
    6,429x = 7,779 × 7,779
  4. Step 4: Simplify right side
    6,429x = 60,512,841
  5. Step 5: Solve for x
    x = 60,512,841/6,429
  6. Step 6: Final answer
    x = 9,412.48

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.