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Finding the Fourth Proportional to 358.76, 496.18 and 321.91

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Solution

The fourth proportional to 358.76, 496.18 and 321.91 is: 445.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.76 : 496.18 = 321.91 : x
  2. Step 2: Convert to fraction form
    358.76/496.18 = 321.91/x
  3. Step 3: Cross multiply
    358.76x = 496.18 × 321.91
  4. Step 4: Simplify right side
    358.76x = 159,725.30
  5. Step 5: Solve for x
    x = 159,725.30/358.76
  6. Step 6: Final answer
    x = 445.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.