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Finding the Third Proportional to 11,428 and 15,438

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Solution

The third proportional to 11,428 and 15,438 is: 20,855.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,428 : 15,438 = 15,438 : x
  2. Step 2: Convert to fraction form
    11,428/15,438 = 15,438/x
  3. Step 3: Cross multiply
    11,428x = 15,438 × 15,438
  4. Step 4: Simplify right side
    11,428x = 238,331,844
  5. Step 5: Solve for x
    x = 238,331,844/11,428
  6. Step 6: Final answer
    x = 20,855.08

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.