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Finding the Third Proportional to 7,718 and 12,428

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Solution

The third proportional to 7,718 and 12,428 is: 20,012.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,718 : 12,428 = 12,428 : x
  2. Step 2: Convert to fraction form
    7,718/12,428 = 12,428/x
  3. Step 3: Cross multiply
    7,718x = 12,428 × 12,428
  4. Step 4: Simplify right side
    7,718x = 154,455,184
  5. Step 5: Solve for x
    x = 154,455,184/7,718
  6. Step 6: Final answer
    x = 20,012.33

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.