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Finding the Fourth Proportional to 358.73, 538.10 and 139.27

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Solution

The fourth proportional to 358.73, 538.10 and 139.27 is: 208.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.73 : 538.10 = 139.27 : x
  2. Step 2: Convert to fraction form
    358.73/538.10 = 139.27/x
  3. Step 3: Cross multiply
    358.73x = 538.10 × 139.27
  4. Step 4: Simplify right side
    358.73x = 74,937.80
  5. Step 5: Solve for x
    x = 74,937.80/358.73
  6. Step 6: Final answer
    x = 208.90

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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.