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Finding the Third Proportional to 7,145 and 11,315

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Solution

The third proportional to 7,145 and 11,315 is: 17,918.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,145 : 11,315 = 11,315 : x
  2. Step 2: Convert to fraction form
    7,145/11,315 = 11,315/x
  3. Step 3: Cross multiply
    7,145x = 11,315 × 11,315
  4. Step 4: Simplify right side
    7,145x = 128,029,225
  5. Step 5: Solve for x
    x = 128,029,225/7,145
  6. Step 6: Final answer
    x = 17,918.72

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.