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Finding the Fourth Proportional to 445.31, 667.40 and 239.45

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Solution

The fourth proportional to 445.31, 667.40 and 239.45 is: 358.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.31 : 667.40 = 239.45 : x
  2. Step 2: Convert to fraction form
    445.31/667.40 = 239.45/x
  3. Step 3: Cross multiply
    445.31x = 667.40 × 239.45
  4. Step 4: Simplify right side
    445.31x = 159,807.73
  5. Step 5: Solve for x
    x = 159,807.73/445.31
  6. Step 6: Final answer
    x = 358.87

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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.