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Finding the Fourth Proportional to 1,229.88, 1,845.06 and 408.40

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Solution

The fourth proportional to 1,229.88, 1,845.06 and 408.40 is: 612.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.88 : 1,845.06 = 408.40 : x
  2. Step 2: Convert to fraction form
    1,229.88/1,845.06 = 408.40/x
  3. Step 3: Cross multiply
    1,229.88x = 1,845.06 × 408.40
  4. Step 4: Simplify right side
    1,229.88x = 753,522.50
  5. Step 5: Solve for x
    x = 753,522.50/1,229.88
  6. Step 6: Final answer
    x = 612.68

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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.