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Finding the Fourth Proportional to 1,230.39, 1,845.25 and 408.85

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Solution

The fourth proportional to 1,230.39, 1,845.25 and 408.85 is: 613.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.39 : 1,845.25 = 408.85 : x
  2. Step 2: Convert to fraction form
    1,230.39/1,845.25 = 408.85/x
  3. Step 3: Cross multiply
    1,230.39x = 1,845.25 × 408.85
  4. Step 4: Simplify right side
    1,230.39x = 754,424.83
  5. Step 5: Solve for x
    x = 754,424.83/1,230.39
  6. Step 6: Final answer
    x = 613.16

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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.