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Finding the Fourth Proportional to 405.61, 559.44 and 281.28

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Solution

The fourth proportional to 405.61, 559.44 and 281.28 is: 387.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.61 : 559.44 = 281.28 : x
  2. Step 2: Convert to fraction form
    405.61/559.44 = 281.28/x
  3. Step 3: Cross multiply
    405.61x = 559.44 × 281.28
  4. Step 4: Simplify right side
    405.61x = 157,359.28
  5. Step 5: Solve for x
    x = 157,359.28/405.61
  6. Step 6: Final answer
    x = 387.96

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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.