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Finding the Third Proportional to 2,491 and 5,315

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Solution

The third proportional to 2,491 and 5,315 is: 11,340.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,491 : 5,315 = 5,315 : x
  2. Step 2: Convert to fraction form
    2,491/5,315 = 5,315/x
  3. Step 3: Cross multiply
    2,491x = 5,315 × 5,315
  4. Step 4: Simplify right side
    2,491x = 28,249,225
  5. Step 5: Solve for x
    x = 28,249,225/2,491
  6. Step 6: Final answer
    x = 11,340.52

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.