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Finding the Fourth Proportional to 115.27, 172.47 and 108.77

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Solution

The fourth proportional to 115.27, 172.47 and 108.77 is: 162.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.27 : 172.47 = 108.77 : x
  2. Step 2: Convert to fraction form
    115.27/172.47 = 108.77/x
  3. Step 3: Cross multiply
    115.27x = 172.47 × 108.77
  4. Step 4: Simplify right side
    115.27x = 18,759.56
  5. Step 5: Solve for x
    x = 18,759.56/115.27
  6. Step 6: Final answer
    x = 162.74

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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.