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Finding the Fourth Proportional to 442.88, 664.34 and 134.72

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Solution

The fourth proportional to 442.88, 664.34 and 134.72 is: 202.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.88 : 664.34 = 134.72 : x
  2. Step 2: Convert to fraction form
    442.88/664.34 = 134.72/x
  3. Step 3: Cross multiply
    442.88x = 664.34 × 134.72
  4. Step 4: Simplify right side
    442.88x = 89,499.88
  5. Step 5: Solve for x
    x = 89,499.88/442.88
  6. Step 6: Final answer
    x = 202.09

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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.