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Finding the Fourth Proportional to 405.61, 559.39 and 331.79

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Solution

The fourth proportional to 405.61, 559.39 and 331.79 is: 457.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.61 : 559.39 = 331.79 : x
  2. Step 2: Convert to fraction form
    405.61/559.39 = 331.79/x
  3. Step 3: Cross multiply
    405.61x = 559.39 × 331.79
  4. Step 4: Simplify right side
    405.61x = 185,600.01
  5. Step 5: Solve for x
    x = 185,600.01/405.61
  6. Step 6: Final answer
    x = 457.58

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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.