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Finding the Fourth Proportional to 144.72, 198.85 and 128.32

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Solution

The fourth proportional to 144.72, 198.85 and 128.32 is: 176.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.72 : 198.85 = 128.32 : x
  2. Step 2: Convert to fraction form
    144.72/198.85 = 128.32/x
  3. Step 3: Cross multiply
    144.72x = 198.85 × 128.32
  4. Step 4: Simplify right side
    144.72x = 25,516.43
  5. Step 5: Solve for x
    x = 25,516.43/144.72
  6. Step 6: Final answer
    x = 176.32

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.