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Finding the Third Proportional to 4,770 and 7,420

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Solution

The third proportional to 4,770 and 7,420 is: 11,542.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,770 : 7,420 = 7,420 : x
  2. Step 2: Convert to fraction form
    4,770/7,420 = 7,420/x
  3. Step 3: Cross multiply
    4,770x = 7,420 × 7,420
  4. Step 4: Simplify right side
    4,770x = 55,056,400
  5. Step 5: Solve for x
    x = 55,056,400/4,770
  6. Step 6: Final answer
    x = 11,542.22

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.