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Finding the Third Proportional to 72 and 154.50

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Solution

The third proportional to 72 and 154.50 is: 331.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    72 : 154.50 = 154.50 : x
  2. Step 2: Convert to fraction form
    72/154.50 = 154.50/x
  3. Step 3: Cross multiply
    72x = 154.50 × 154.50
  4. Step 4: Simplify right side
    72x = 23,870.25
  5. Step 5: Solve for x
    x = 23,870.25/72
  6. Step 6: Final answer
    x = 331.53

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.