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Finding the Third Proportional to 11,106 and 15,430

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Solution

The third proportional to 11,106 and 15,430 is: 21,437.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,106 : 15,430 = 15,430 : x
  2. Step 2: Convert to fraction form
    11,106/15,430 = 15,430/x
  3. Step 3: Cross multiply
    11,106x = 15,430 × 15,430
  4. Step 4: Simplify right side
    11,106x = 238,084,900
  5. Step 5: Solve for x
    x = 238,084,900/11,106
  6. Step 6: Final answer
    x = 21,437.50

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.