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Finding the Third Proportional to 30.88 and 65.50

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Solution

The third proportional to 30.88 and 65.50 is: 138.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.88 : 65.50 = 65.50 : x
  2. Step 2: Convert to fraction form
    30.88/65.50 = 65.50/x
  3. Step 3: Cross multiply
    30.88x = 65.50 × 65.50
  4. Step 4: Simplify right side
    30.88x = 4,290.25
  5. Step 5: Solve for x
    x = 4,290.25/30.88
  6. Step 6: Final answer
    x = 138.96

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.