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Finding the Fourth Proportional to 442.28, 663.90 and 279.56

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Solution

The fourth proportional to 442.28, 663.90 and 279.56 is: 419.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.28 : 663.90 = 279.56 : x
  2. Step 2: Convert to fraction form
    442.28/663.90 = 279.56/x
  3. Step 3: Cross multiply
    442.28x = 663.90 × 279.56
  4. Step 4: Simplify right side
    442.28x = 185,599.88
  5. Step 5: Solve for x
    x = 185,599.88/442.28
  6. Step 6: Final answer
    x = 419.64

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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.