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Finding the Fourth Proportional to 406.67, 561.18 and 238.67

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Solution

The fourth proportional to 406.67, 561.18 and 238.67 is: 329.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.67 : 561.18 = 238.67 : x
  2. Step 2: Convert to fraction form
    406.67/561.18 = 238.67/x
  3. Step 3: Cross multiply
    406.67x = 561.18 × 238.67
  4. Step 4: Simplify right side
    406.67x = 133,932.83
  5. Step 5: Solve for x
    x = 133,932.83/406.67
  6. Step 6: Final answer
    x = 329.34

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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.