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Finding the Fourth Proportional to 329.76, 455.36 and 318.88

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Solution

The fourth proportional to 329.76, 455.36 and 318.88 is: 440.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.76 : 455.36 = 318.88 : x
  2. Step 2: Convert to fraction form
    329.76/455.36 = 318.88/x
  3. Step 3: Cross multiply
    329.76x = 455.36 × 318.88
  4. Step 4: Simplify right side
    329.76x = 145,205.20
  5. Step 5: Solve for x
    x = 145,205.20/329.76
  6. Step 6: Final answer
    x = 440.34

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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.