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Finding the Third Proportional to 4,938.75 and 7,821

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Solution

The third proportional to 4,938.75 and 7,821 is: 12,385.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,938.75 : 7,821 = 7,821 : x
  2. Step 2: Convert to fraction form
    4,938.75/7,821 = 7,821/x
  3. Step 3: Cross multiply
    4,938.75x = 7,821 × 7,821
  4. Step 4: Simplify right side
    4,938.75x = 61,168,041
  5. Step 5: Solve for x
    x = 61,168,041/4,938.75
  6. Step 6: Final answer
    x = 12,385.33

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.