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Finding the Third Proportional to 7,778 and 10,515

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Solution

The third proportional to 7,778 and 10,515 is: 14,215.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,778 : 10,515 = 10,515 : x
  2. Step 2: Convert to fraction form
    7,778/10,515 = 10,515/x
  3. Step 3: Cross multiply
    7,778x = 10,515 × 10,515
  4. Step 4: Simplify right side
    7,778x = 110,565,225
  5. Step 5: Solve for x
    x = 110,565,225/7,778
  6. Step 6: Final answer
    x = 14,215.12

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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.