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Finding the Third Proportional to 4,840 and 7,720

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Solution

The third proportional to 4,840 and 7,720 is: 12,313.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,840 : 7,720 = 7,720 : x
  2. Step 2: Convert to fraction form
    4,840/7,720 = 7,720/x
  3. Step 3: Cross multiply
    4,840x = 7,720 × 7,720
  4. Step 4: Simplify right side
    4,840x = 59,598,400
  5. Step 5: Solve for x
    x = 59,598,400/4,840
  6. Step 6: Final answer
    x = 12,313.72

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.