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Finding the Fourth Proportional to 144.12, 198.47 and 128.67

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Solution

The fourth proportional to 144.12, 198.47 and 128.67 is: 177.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.12 : 198.47 = 128.67 : x
  2. Step 2: Convert to fraction form
    144.12/198.47 = 128.67/x
  3. Step 3: Cross multiply
    144.12x = 198.47 × 128.67
  4. Step 4: Simplify right side
    144.12x = 25,536.49
  5. Step 5: Solve for x
    x = 25,536.49/144.12
  6. Step 6: Final answer
    x = 177.19

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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.