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Finding the Fourth Proportional to 358.90, 538.38 and 142.63

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Solution

The fourth proportional to 358.90, 538.38 and 142.63 is: 213.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.90 : 538.38 = 142.63 : x
  2. Step 2: Convert to fraction form
    358.90/538.38 = 142.63/x
  3. Step 3: Cross multiply
    358.90x = 538.38 × 142.63
  4. Step 4: Simplify right side
    358.90x = 76,789.14
  5. Step 5: Solve for x
    x = 76,789.14/358.90
  6. Step 6: Final answer
    x = 213.96

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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.