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Finding the Fourth Proportional to 148.14, 203.97 and 128.43

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Solution

The fourth proportional to 148.14, 203.97 and 128.43 is: 176.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.14 : 203.97 = 128.43 : x
  2. Step 2: Convert to fraction form
    148.14/203.97 = 128.43/x
  3. Step 3: Cross multiply
    148.14x = 203.97 × 128.43
  4. Step 4: Simplify right side
    148.14x = 26,195.48
  5. Step 5: Solve for x
    x = 26,195.48/148.14
  6. Step 6: Final answer
    x = 176.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.