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Finding the Third Proportional to 128.63 and 211.13

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Solution

The third proportional to 128.63 and 211.13 is: 346.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.63 : 211.13 = 211.13 : x
  2. Step 2: Convert to fraction form
    128.63/211.13 = 211.13/x
  3. Step 3: Cross multiply
    128.63x = 211.13 × 211.13
  4. Step 4: Simplify right side
    128.63x = 44,573.77
  5. Step 5: Solve for x
    x = 44,573.77/128.63
  6. Step 6: Final answer
    x = 346.54

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.