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Finding the Fourth Proportional to 172.55, 259.78 and 118.79

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Solution

The fourth proportional to 172.55, 259.78 and 118.79 is: 178.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.55 : 259.78 = 118.79 : x
  2. Step 2: Convert to fraction form
    172.55/259.78 = 118.79/x
  3. Step 3: Cross multiply
    172.55x = 259.78 × 118.79
  4. Step 4: Simplify right side
    172.55x = 30,859.62
  5. Step 5: Solve for x
    x = 30,859.62/172.55
  6. Step 6: Final answer
    x = 178.85

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.