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Finding the Fourth Proportional to 791.08, 1,185.68 and 328.76

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Solution

The fourth proportional to 791.08, 1,185.68 and 328.76 is: 492.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.08 : 1,185.68 = 328.76 : x
  2. Step 2: Convert to fraction form
    791.08/1,185.68 = 328.76/x
  3. Step 3: Cross multiply
    791.08x = 1,185.68 × 328.76
  4. Step 4: Simplify right side
    791.08x = 389,804.16
  5. Step 5: Solve for x
    x = 389,804.16/791.08
  6. Step 6: Final answer
    x = 492.75

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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.