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Finding the Third Proportional to 8,140 and 12,178

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Solution

The third proportional to 8,140 and 12,178 is: 18,219.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,140 : 12,178 = 12,178 : x
  2. Step 2: Convert to fraction form
    8,140/12,178 = 12,178/x
  3. Step 3: Cross multiply
    8,140x = 12,178 × 12,178
  4. Step 4: Simplify right side
    8,140x = 148,303,684
  5. Step 5: Solve for x
    x = 148,303,684/8,140
  6. Step 6: Final answer
    x = 18,219.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.