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Finding the Fourth Proportional to 172.97, 259.45 and 51.21

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Solution

The fourth proportional to 172.97, 259.45 and 51.21 is: 76.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.97 : 259.45 = 51.21 : x
  2. Step 2: Convert to fraction form
    172.97/259.45 = 51.21/x
  3. Step 3: Cross multiply
    172.97x = 259.45 × 51.21
  4. Step 4: Simplify right side
    172.97x = 13,286.18
  5. Step 5: Solve for x
    x = 13,286.18/172.97
  6. Step 6: Final answer
    x = 76.81

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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.