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Finding the Third Proportional to 8,421.75 and 12,890.25

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Solution

The third proportional to 8,421.75 and 12,890.25 is: 19,729.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.75 : 12,890.25 = 12,890.25 : x
  2. Step 2: Convert to fraction form
    8,421.75/12,890.25 = 12,890.25/x
  3. Step 3: Cross multiply
    8,421.75x = 12,890.25 × 12,890.25
  4. Step 4: Simplify right side
    8,421.75x = 166,158,545.06
  5. Step 5: Solve for x
    x = 166,158,545.06/8,421.75
  6. Step 6: Final answer
    x = 19,729.69

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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.