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Finding the Fourth Proportional to 128.48, 193.41 and 115.25

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Solution

The fourth proportional to 128.48, 193.41 and 115.25 is: 173.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.48 : 193.41 = 115.25 : x
  2. Step 2: Convert to fraction form
    128.48/193.41 = 115.25/x
  3. Step 3: Cross multiply
    128.48x = 193.41 × 115.25
  4. Step 4: Simplify right side
    128.48x = 22,290.21
  5. Step 5: Solve for x
    x = 22,290.21/128.48
  6. Step 6: Final answer
    x = 173.49

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.