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Finding the Fourth Proportional to 636.72, 955.28 and 328.80

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Solution

The fourth proportional to 636.72, 955.28 and 328.80 is: 493.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.72 : 955.28 = 328.80 : x
  2. Step 2: Convert to fraction form
    636.72/955.28 = 328.80/x
  3. Step 3: Cross multiply
    636.72x = 955.28 × 328.80
  4. Step 4: Simplify right side
    636.72x = 314,096.06
  5. Step 5: Solve for x
    x = 314,096.06/636.72
  6. Step 6: Final answer
    x = 493.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.