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Finding the Fourth Proportional to 358.20, 495 and 261

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Solution

The fourth proportional to 358.20, 495 and 261 is: 360.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.20 : 495 = 261 : x
  2. Step 2: Convert to fraction form
    358.20/495 = 261/x
  3. Step 3: Cross multiply
    358.20x = 495 × 261
  4. Step 4: Simplify right side
    358.20x = 129,195
  5. Step 5: Solve for x
    x = 129,195/358.20
  6. Step 6: Final answer
    x = 360.68

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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.