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Finding the Fourth Proportional to 358.85, 538.18 and 139.50

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Solution

The fourth proportional to 358.85, 538.18 and 139.50 is: 209.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.85 : 538.18 = 139.50 : x
  2. Step 2: Convert to fraction form
    358.85/538.18 = 139.50/x
  3. Step 3: Cross multiply
    358.85x = 538.18 × 139.50
  4. Step 4: Simplify right side
    358.85x = 75,076.11
  5. Step 5: Solve for x
    x = 75,076.11/358.85
  6. Step 6: Final answer
    x = 209.21

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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.