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Finding the Third Proportional to 7,778 and 9,155

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Solution

The third proportional to 7,778 and 9,155 is: 10,775.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,778 : 9,155 = 9,155 : x
  2. Step 2: Convert to fraction form
    7,778/9,155 = 9,155/x
  3. Step 3: Cross multiply
    7,778x = 9,155 × 9,155
  4. Step 4: Simplify right side
    7,778x = 83,814,025
  5. Step 5: Solve for x
    x = 83,814,025/7,778
  6. Step 6: Final answer
    x = 10,775.78

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.