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Finding the Third Proportional to 5,121 and 7,830.28

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Solution

The third proportional to 5,121 and 7,830.28 is: 11,972.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,121 : 7,830.28 = 7,830.28 : x
  2. Step 2: Convert to fraction form
    5,121/7,830.28 = 7,830.28/x
  3. Step 3: Cross multiply
    5,121x = 7,830.28 × 7,830.28
  4. Step 4: Simplify right side
    5,121x = 61,313,304.45
  5. Step 5: Solve for x
    x = 61,313,304.45/5,121
  6. Step 6: Final answer
    x = 11,972.92

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.