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Finding the Fourth Proportional to 172.53, 258.96 and 81.29

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Solution

The fourth proportional to 172.53, 258.96 and 81.29 is: 122.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.53 : 258.96 = 81.29 : x
  2. Step 2: Convert to fraction form
    172.53/258.96 = 81.29/x
  3. Step 3: Cross multiply
    172.53x = 258.96 × 81.29
  4. Step 4: Simplify right side
    172.53x = 21,050.86
  5. Step 5: Solve for x
    x = 21,050.86/172.53
  6. Step 6: Final answer
    x = 122.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.