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Finding the Fourth Proportional to 423.42, 584.23 and 255.45

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Solution

The fourth proportional to 423.42, 584.23 and 255.45 is: 352.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.42 : 584.23 = 255.45 : x
  2. Step 2: Convert to fraction form
    423.42/584.23 = 255.45/x
  3. Step 3: Cross multiply
    423.42x = 584.23 × 255.45
  4. Step 4: Simplify right side
    423.42x = 149,241.55
  5. Step 5: Solve for x
    x = 149,241.55/423.42
  6. Step 6: Final answer
    x = 352.47

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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.