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Finding the Third Proportional to 211,310 and 287,805

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Solution

The third proportional to 211,310 and 287,805 is: 391,991.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,310 : 287,805 = 287,805 : x
  2. Step 2: Convert to fraction form
    211,310/287,805 = 287,805/x
  3. Step 3: Cross multiply
    211,310x = 287,805 × 287,805
  4. Step 4: Simplify right side
    211,310x = 82,831,718,025
  5. Step 5: Solve for x
    x = 82,831,718,025/211,310
  6. Step 6: Final answer
    x = 391,991.47

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.