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Finding the Fourth Proportional to 479.81, 662.23 and 311.97

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Solution

The fourth proportional to 479.81, 662.23 and 311.97 is: 430.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.81 : 662.23 = 311.97 : x
  2. Step 2: Convert to fraction form
    479.81/662.23 = 311.97/x
  3. Step 3: Cross multiply
    479.81x = 662.23 × 311.97
  4. Step 4: Simplify right side
    479.81x = 206,592.63
  5. Step 5: Solve for x
    x = 206,592.63/479.81
  6. Step 6: Final answer
    x = 430.58

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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.