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Finding the Fourth Proportional to 405.44, 559.38 and 280.88

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Solution

The fourth proportional to 405.44, 559.38 and 280.88 is: 387.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.44 : 559.38 = 280.88 : x
  2. Step 2: Convert to fraction form
    405.44/559.38 = 280.88/x
  3. Step 3: Cross multiply
    405.44x = 559.38 × 280.88
  4. Step 4: Simplify right side
    405.44x = 157,118.65
  5. Step 5: Solve for x
    x = 157,118.65/405.44
  6. Step 6: Final answer
    x = 387.53

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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.