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Finding the Fourth Proportional to 445.10, 667.08 and 239.78

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Solution

The fourth proportional to 445.10, 667.08 and 239.78 is: 359.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.10 : 667.08 = 239.78 : x
  2. Step 2: Convert to fraction form
    445.10/667.08 = 239.78/x
  3. Step 3: Cross multiply
    445.10x = 667.08 × 239.78
  4. Step 4: Simplify right side
    445.10x = 159,952.44
  5. Step 5: Solve for x
    x = 159,952.44/445.10
  6. Step 6: Final answer
    x = 359.36

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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.