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Finding the Third Proportional to 4,147.38 and 6,421.88

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Solution

The third proportional to 4,147.38 and 6,421.88 is: 9,943.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,147.38 : 6,421.88 = 6,421.88 : x
  2. Step 2: Convert to fraction form
    4,147.38/6,421.88 = 6,421.88/x
  3. Step 3: Cross multiply
    4,147.38x = 6,421.88 × 6,421.88
  4. Step 4: Simplify right side
    4,147.38x = 41,240,478.52
  5. Step 5: Solve for x
    x = 41,240,478.52/4,147.38
  6. Step 6: Final answer
    x = 9,943.75

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.