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Finding the Fourth Proportional to 789.72, 1,185 and 303.08

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Solution

The fourth proportional to 789.72, 1,185 and 303.08 is: 454.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.72 : 1,185 = 303.08 : x
  2. Step 2: Convert to fraction form
    789.72/1,185 = 303.08/x
  3. Step 3: Cross multiply
    789.72x = 1,185 × 303.08
  4. Step 4: Simplify right side
    789.72x = 359,149.80
  5. Step 5: Solve for x
    x = 359,149.80/789.72
  6. Step 6: Final answer
    x = 454.78

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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.