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Finding the Fourth Proportional to 358.91, 495.95 and 280.43

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Solution

The fourth proportional to 358.91, 495.95 and 280.43 is: 387.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.91 : 495.95 = 280.43 : x
  2. Step 2: Convert to fraction form
    358.91/495.95 = 280.43/x
  3. Step 3: Cross multiply
    358.91x = 495.95 × 280.43
  4. Step 4: Simplify right side
    358.91x = 139,077.86
  5. Step 5: Solve for x
    x = 139,077.86/358.91
  6. Step 6: Final answer
    x = 387.50

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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.