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Finding the Third Proportional to 4,990 and 7,828

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Solution

The third proportional to 4,990 and 7,828 is: 12,280.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,990 : 7,828 = 7,828 : x
  2. Step 2: Convert to fraction form
    4,990/7,828 = 7,828/x
  3. Step 3: Cross multiply
    4,990x = 7,828 × 7,828
  4. Step 4: Simplify right side
    4,990x = 61,277,584
  5. Step 5: Solve for x
    x = 61,277,584/4,990
  6. Step 6: Final answer
    x = 12,280.08

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.