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Finding the Fourth Proportional to 406, 609.04 and 128.42

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Solution

The fourth proportional to 406, 609.04 and 128.42 is: 192.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    406 : 609.04 = 128.42 : x
  2. Step 2: Convert to fraction form
    406/609.04 = 128.42/x
  3. Step 3: Cross multiply
    406x = 609.04 × 128.42
  4. Step 4: Simplify right side
    406x = 78,212.92
  5. Step 5: Solve for x
    x = 78,212.92/406
  6. Step 6: Final answer
    x = 192.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.