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Finding the Fourth Proportional to 115.26, 172.69 and 54.30

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Solution

The fourth proportional to 115.26, 172.69 and 54.30 is: 81.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.26 : 172.69 = 54.30 : x
  2. Step 2: Convert to fraction form
    115.26/172.69 = 54.30/x
  3. Step 3: Cross multiply
    115.26x = 172.69 × 54.30
  4. Step 4: Simplify right side
    115.26x = 9,377.58
  5. Step 5: Solve for x
    x = 9,377.58/115.26
  6. Step 6: Final answer
    x = 81.36

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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.