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Finding the Fourth Proportional to 115.54, 172.94 and 92.28

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Solution

The fourth proportional to 115.54, 172.94 and 92.28 is: 138.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.54 : 172.94 = 92.28 : x
  2. Step 2: Convert to fraction form
    115.54/172.94 = 92.28/x
  3. Step 3: Cross multiply
    115.54x = 172.94 × 92.28
  4. Step 4: Simplify right side
    115.54x = 15,959.13
  5. Step 5: Solve for x
    x = 15,959.13/115.54
  6. Step 6: Final answer
    x = 138.13

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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.