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Finding the Third Proportional to 8,458.50 and 12,639

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Solution

The third proportional to 8,458.50 and 12,639 is: 18,885.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,458.50 : 12,639 = 12,639 : x
  2. Step 2: Convert to fraction form
    8,458.50/12,639 = 12,639/x
  3. Step 3: Cross multiply
    8,458.50x = 12,639 × 12,639
  4. Step 4: Simplify right side
    8,458.50x = 159,744,321
  5. Step 5: Solve for x
    x = 159,744,321/8,458.50
  6. Step 6: Final answer
    x = 18,885.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.