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Finding the Fourth Proportional to 1,230.78, 1,845.79 and 408.89

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Solution

The fourth proportional to 1,230.78, 1,845.79 and 408.89 is: 613.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.78 : 1,845.79 = 408.89 : x
  2. Step 2: Convert to fraction form
    1,230.78/1,845.79 = 408.89/x
  3. Step 3: Cross multiply
    1,230.78x = 1,845.79 × 408.89
  4. Step 4: Simplify right side
    1,230.78x = 754,725.07
  5. Step 5: Solve for x
    x = 754,725.07/1,230.78
  6. Step 6: Final answer
    x = 613.21

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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.