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Finding the Third Proportional to 7,158 and 11,428

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Solution

The third proportional to 7,158 and 11,428 is: 18,245.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,158 : 11,428 = 11,428 : x
  2. Step 2: Convert to fraction form
    7,158/11,428 = 11,428/x
  3. Step 3: Cross multiply
    7,158x = 11,428 × 11,428
  4. Step 4: Simplify right side
    7,158x = 130,599,184
  5. Step 5: Solve for x
    x = 130,599,184/7,158
  6. Step 6: Final answer
    x = 18,245.21

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.