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Finding the Fourth Proportional to 115.45, 172.54 and 108.79

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Solution

The fourth proportional to 115.45, 172.54 and 108.79 is: 162.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.45 : 172.54 = 108.79 : x
  2. Step 2: Convert to fraction form
    115.45/172.54 = 108.79/x
  3. Step 3: Cross multiply
    115.45x = 172.54 × 108.79
  4. Step 4: Simplify right side
    115.45x = 18,770.63
  5. Step 5: Solve for x
    x = 18,770.63/115.45
  6. Step 6: Final answer
    x = 162.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.