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Finding the Fourth Proportional to 406.76, 561.48 and 276.44

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Solution

The fourth proportional to 406.76, 561.48 and 276.44 is: 381.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.76 : 561.48 = 276.44 : x
  2. Step 2: Convert to fraction form
    406.76/561.48 = 276.44/x
  3. Step 3: Cross multiply
    406.76x = 561.48 × 276.44
  4. Step 4: Simplify right side
    406.76x = 155,215.53
  5. Step 5: Solve for x
    x = 155,215.53/406.76
  6. Step 6: Final answer
    x = 381.59

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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.