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Finding the Fourth Proportional to 405.92, 609.42 and 395.12

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Solution

The fourth proportional to 405.92, 609.42 and 395.12 is: 593.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.92 : 609.42 = 395.12 : x
  2. Step 2: Convert to fraction form
    405.92/609.42 = 395.12/x
  3. Step 3: Cross multiply
    405.92x = 609.42 × 395.12
  4. Step 4: Simplify right side
    405.92x = 240,794.03
  5. Step 5: Solve for x
    x = 240,794.03/405.92
  6. Step 6: Final answer
    x = 593.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.