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Finding the Fourth Proportional to 405.17, 559.55 and 331.73

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Solution

The fourth proportional to 405.17, 559.55 and 331.73 is: 458.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.17 : 559.55 = 331.73 : x
  2. Step 2: Convert to fraction form
    405.17/559.55 = 331.73/x
  3. Step 3: Cross multiply
    405.17x = 559.55 × 331.73
  4. Step 4: Simplify right side
    405.17x = 185,617.86
  5. Step 5: Solve for x
    x = 185,617.86/405.17
  6. Step 6: Final answer
    x = 458.12

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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.