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Finding the Fourth Proportional to 479.91, 662.42 and 280.79

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Solution

The fourth proportional to 479.91, 662.42 and 280.79 is: 387.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.91 : 662.42 = 280.79 : x
  2. Step 2: Convert to fraction form
    479.91/662.42 = 280.79/x
  3. Step 3: Cross multiply
    479.91x = 662.42 × 280.79
  4. Step 4: Simplify right side
    479.91x = 186,000.91
  5. Step 5: Solve for x
    x = 186,000.91/479.91
  6. Step 6: Final answer
    x = 387.57

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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.