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Finding the Fourth Proportional to 358.72, 495.05 and 211.38

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Solution

The fourth proportional to 358.72, 495.05 and 211.38 is: 291.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.72 : 495.05 = 211.38 : x
  2. Step 2: Convert to fraction form
    358.72/495.05 = 211.38/x
  3. Step 3: Cross multiply
    358.72x = 495.05 × 211.38
  4. Step 4: Simplify right side
    358.72x = 104,643.67
  5. Step 5: Solve for x
    x = 104,643.67/358.72
  6. Step 6: Final answer
    x = 291.71

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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.