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Finding the Third Proportional to 10,420 and 14,878

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Solution

The third proportional to 10,420 and 14,878 is: 21,243.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,420 : 14,878 = 14,878 : x
  2. Step 2: Convert to fraction form
    10,420/14,878 = 14,878/x
  3. Step 3: Cross multiply
    10,420x = 14,878 × 14,878
  4. Step 4: Simplify right side
    10,420x = 221,354,884
  5. Step 5: Solve for x
    x = 221,354,884/10,420
  6. Step 6: Final answer
    x = 21,243.27

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.