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Finding the Third Proportional to 4,780 and 7,410

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Solution

The third proportional to 4,780 and 7,410 is: 11,487.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,780 : 7,410 = 7,410 : x
  2. Step 2: Convert to fraction form
    4,780/7,410 = 7,410/x
  3. Step 3: Cross multiply
    4,780x = 7,410 × 7,410
  4. Step 4: Simplify right side
    4,780x = 54,908,100
  5. Step 5: Solve for x
    x = 54,908,100/4,780
  6. Step 6: Final answer
    x = 11,487.05

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.