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Finding the Fourth Proportional to 406.72, 561.48 and 251.56

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Solution

The fourth proportional to 406.72, 561.48 and 251.56 is: 347.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.72 : 561.48 = 251.56 : x
  2. Step 2: Convert to fraction form
    406.72/561.48 = 251.56/x
  3. Step 3: Cross multiply
    406.72x = 561.48 × 251.56
  4. Step 4: Simplify right side
    406.72x = 141,245.91
  5. Step 5: Solve for x
    x = 141,245.91/406.72
  6. Step 6: Final answer
    x = 347.28

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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.