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Finding the Fourth Proportional to 358.91, 538.44 and 212.61

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Solution

The fourth proportional to 358.91, 538.44 and 212.61 is: 318.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.91 : 538.44 = 212.61 : x
  2. Step 2: Convert to fraction form
    358.91/538.44 = 212.61/x
  3. Step 3: Cross multiply
    358.91x = 538.44 × 212.61
  4. Step 4: Simplify right side
    358.91x = 114,475.04
  5. Step 5: Solve for x
    x = 114,475.04/358.91
  6. Step 6: Final answer
    x = 318.95

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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.