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Finding the Fourth Proportional to 791.28, 1,185.96 and 328.88

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Solution

The fourth proportional to 791.28, 1,185.96 and 328.88 is: 492.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.28 : 1,185.96 = 328.88 : x
  2. Step 2: Convert to fraction form
    791.28/1,185.96 = 328.88/x
  3. Step 3: Cross multiply
    791.28x = 1,185.96 × 328.88
  4. Step 4: Simplify right side
    791.28x = 390,038.52
  5. Step 5: Solve for x
    x = 390,038.52/791.28
  6. Step 6: Final answer
    x = 492.92

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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.