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Finding the Fourth Proportional to 479.21, 660.91 and 310.97

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Solution

The fourth proportional to 479.21, 660.91 and 310.97 is: 428.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.21 : 660.91 = 310.97 : x
  2. Step 2: Convert to fraction form
    479.21/660.91 = 310.97/x
  3. Step 3: Cross multiply
    479.21x = 660.91 × 310.97
  4. Step 4: Simplify right side
    479.21x = 205,518.32
  5. Step 5: Solve for x
    x = 205,518.32/479.21
  6. Step 6: Final answer
    x = 428.87

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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.