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Finding the Third Proportional to 211.78 and 556.03

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Solution

The third proportional to 211.78 and 556.03 is: 1,459.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.78 : 556.03 = 556.03 : x
  2. Step 2: Convert to fraction form
    211.78/556.03 = 556.03/x
  3. Step 3: Cross multiply
    211.78x = 556.03 × 556.03
  4. Step 4: Simplify right side
    211.78x = 309,170.75
  5. Step 5: Solve for x
    x = 309,170.75/211.78
  6. Step 6: Final answer
    x = 1,459.86

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Why These Related Problems?

These problems maintain the same ratio (2.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.