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Finding the Fourth Proportional to 115.92, 172.64 and 108.95

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Solution

The fourth proportional to 115.92, 172.64 and 108.95 is: 162.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.92 : 172.64 = 108.95 : x
  2. Step 2: Convert to fraction form
    115.92/172.64 = 108.95/x
  3. Step 3: Cross multiply
    115.92x = 172.64 × 108.95
  4. Step 4: Simplify right side
    115.92x = 18,807.72
  5. Step 5: Solve for x
    x = 18,807.72/115.92
  6. Step 6: Final answer
    x = 162.25

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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.