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Finding the Third Proportional to 128.63 and 271.50

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Solution

The third proportional to 128.63 and 271.50 is: 573.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.63 : 271.50 = 271.50 : x
  2. Step 2: Convert to fraction form
    128.63/271.50 = 271.50/x
  3. Step 3: Cross multiply
    128.63x = 271.50 × 271.50
  4. Step 4: Simplify right side
    128.63x = 73,712.25
  5. Step 5: Solve for x
    x = 73,712.25/128.63
  6. Step 6: Final answer
    x = 573.08

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.