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Finding the Fourth Proportional to 442.78, 664.65 and 280.06

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Solution

The fourth proportional to 442.78, 664.65 and 280.06 is: 420.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.78 : 664.65 = 280.06 : x
  2. Step 2: Convert to fraction form
    442.78/664.65 = 280.06/x
  3. Step 3: Cross multiply
    442.78x = 664.65 × 280.06
  4. Step 4: Simplify right side
    442.78x = 186,141.88
  5. Step 5: Solve for x
    x = 186,141.88/442.78
  6. Step 6: Final answer
    x = 420.39

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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.