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Finding the Fourth Proportional to 405.86, 559.50 and 281.33

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Solution

The fourth proportional to 405.86, 559.50 and 281.33 is: 387.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.86 : 559.50 = 281.33 : x
  2. Step 2: Convert to fraction form
    405.86/559.50 = 281.33/x
  3. Step 3: Cross multiply
    405.86x = 559.50 × 281.33
  4. Step 4: Simplify right side
    405.86x = 157,404.14
  5. Step 5: Solve for x
    x = 157,404.14/405.86
  6. Step 6: Final answer
    x = 387.83

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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.