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Finding the Third Proportional to 72 and 172.88

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Solution

The third proportional to 72 and 172.88 is: 415.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    72 : 172.88 = 172.88 : x
  2. Step 2: Convert to fraction form
    72/172.88 = 172.88/x
  3. Step 3: Cross multiply
    72x = 172.88 × 172.88
  4. Step 4: Simplify right side
    72x = 29,885.77
  5. Step 5: Solve for x
    x = 29,885.77/72
  6. Step 6: Final answer
    x = 415.08

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Why These Related Problems?

These problems maintain the same ratio (2.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.