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Finding the Third Proportional to 75.23 and 128.50

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Solution

The third proportional to 75.23 and 128.50 is: 219.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.23 : 128.50 = 128.50 : x
  2. Step 2: Convert to fraction form
    75.23/128.50 = 128.50/x
  3. Step 3: Cross multiply
    75.23x = 128.50 × 128.50
  4. Step 4: Simplify right side
    75.23x = 16,511.25
  5. Step 5: Solve for x
    x = 16,511.25/75.23
  6. Step 6: Final answer
    x = 219.46

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Why These Related Problems?

These problems maintain the same ratio (1.71) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.