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Finding the Fourth Proportional to 358.90, 495.20 and 211.50

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Solution

The fourth proportional to 358.90, 495.20 and 211.50 is: 291.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.90 : 495.20 = 211.50 : x
  2. Step 2: Convert to fraction form
    358.90/495.20 = 211.50/x
  3. Step 3: Cross multiply
    358.90x = 495.20 × 211.50
  4. Step 4: Simplify right side
    358.90x = 104,735.33
  5. Step 5: Solve for x
    x = 104,735.33/358.90
  6. Step 6: Final answer
    x = 291.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.