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Finding the Fourth Proportional to 423.42, 584.28 and 257.76

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Solution

The fourth proportional to 423.42, 584.28 and 257.76 is: 355.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.42 : 584.28 = 257.76 : x
  2. Step 2: Convert to fraction form
    423.42/584.28 = 257.76/x
  3. Step 3: Cross multiply
    423.42x = 584.28 × 257.76
  4. Step 4: Simplify right side
    423.42x = 150,604.01
  5. Step 5: Solve for x
    x = 150,604.01/423.42
  6. Step 6: Final answer
    x = 355.68

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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.