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Finding the Fourth Proportional to 144.54, 199.53 and 128.88

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Solution

The fourth proportional to 144.54, 199.53 and 128.88 is: 177.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.54 : 199.53 = 128.88 : x
  2. Step 2: Convert to fraction form
    144.54/199.53 = 128.88/x
  3. Step 3: Cross multiply
    144.54x = 199.53 × 128.88
  4. Step 4: Simplify right side
    144.54x = 25,715.43
  5. Step 5: Solve for x
    x = 25,715.43/144.54
  6. Step 6: Final answer
    x = 177.91

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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.