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Finding the Fourth Proportional to 358.80, 538.10 and 139.34

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Solution

The fourth proportional to 358.80, 538.10 and 139.34 is: 208.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.80 : 538.10 = 139.34 : x
  2. Step 2: Convert to fraction form
    358.80/538.10 = 139.34/x
  3. Step 3: Cross multiply
    358.80x = 538.10 × 139.34
  4. Step 4: Simplify right side
    358.80x = 74,975.47
  5. Step 5: Solve for x
    x = 74,975.47/358.80
  6. Step 6: Final answer
    x = 208.96

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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.