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Finding the Fourth Proportional to 653.28, 980.64 and 328.80

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Solution

The fourth proportional to 653.28, 980.64 and 328.80 is: 493.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.28 : 980.64 = 328.80 : x
  2. Step 2: Convert to fraction form
    653.28/980.64 = 328.80/x
  3. Step 3: Cross multiply
    653.28x = 980.64 × 328.80
  4. Step 4: Simplify right side
    653.28x = 322,434.43
  5. Step 5: Solve for x
    x = 322,434.43/653.28
  6. Step 6: Final answer
    x = 493.56

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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.