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Finding the Fourth Proportional to 115.45, 172.98 and 111.22

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Solution

The fourth proportional to 115.45, 172.98 and 111.22 is: 166.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.45 : 172.98 = 111.22 : x
  2. Step 2: Convert to fraction form
    115.45/172.98 = 111.22/x
  3. Step 3: Cross multiply
    115.45x = 172.98 × 111.22
  4. Step 4: Simplify right side
    115.45x = 19,238.84
  5. Step 5: Solve for x
    x = 19,238.84/115.45
  6. Step 6: Final answer
    x = 166.64

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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.