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Finding the Fourth Proportional to 442.08, 661.92 and 279.36

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Solution

The fourth proportional to 442.08, 661.92 and 279.36 is: 418.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.08 : 661.92 = 279.36 : x
  2. Step 2: Convert to fraction form
    442.08/661.92 = 279.36/x
  3. Step 3: Cross multiply
    442.08x = 661.92 × 279.36
  4. Step 4: Simplify right side
    442.08x = 184,913.97
  5. Step 5: Solve for x
    x = 184,913.97/442.08
  6. Step 6: Final answer
    x = 418.28

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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.