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Finding the Third Proportional to 7,890 and 9,106

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Solution

The third proportional to 7,890 and 9,106 is: 10,509.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,890 : 9,106 = 9,106 : x
  2. Step 2: Convert to fraction form
    7,890/9,106 = 9,106/x
  3. Step 3: Cross multiply
    7,890x = 9,106 × 9,106
  4. Step 4: Simplify right side
    7,890x = 82,919,236
  5. Step 5: Solve for x
    x = 82,919,236/7,890
  6. Step 6: Final answer
    x = 10,509.41

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.