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Finding the Fourth Proportional to 1,230.55, 1,845.79 and 408.49

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Solution

The fourth proportional to 1,230.55, 1,845.79 and 408.49 is: 612.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.55 : 1,845.79 = 408.49 : x
  2. Step 2: Convert to fraction form
    1,230.55/1,845.79 = 408.49/x
  3. Step 3: Cross multiply
    1,230.55x = 1,845.79 × 408.49
  4. Step 4: Simplify right side
    1,230.55x = 753,986.76
  5. Step 5: Solve for x
    x = 753,986.76/1,230.55
  6. Step 6: Final answer
    x = 612.72

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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.