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Finding the Fourth Proportional to 406.73, 561.28 and 238.72

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Solution

The fourth proportional to 406.73, 561.28 and 238.72 is: 329.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.73 : 561.28 = 238.72 : x
  2. Step 2: Convert to fraction form
    406.73/561.28 = 238.72/x
  3. Step 3: Cross multiply
    406.73x = 561.28 × 238.72
  4. Step 4: Simplify right side
    406.73x = 133,988.76
  5. Step 5: Solve for x
    x = 133,988.76/406.73
  6. Step 6: Final answer
    x = 329.43

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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.