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Finding the Fourth Proportional to 1,229.10, 1,843.20 and 407.40

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Solution

The fourth proportional to 1,229.10, 1,843.20 and 407.40 is: 610.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.10 : 1,843.20 = 407.40 : x
  2. Step 2: Convert to fraction form
    1,229.10/1,843.20 = 407.40/x
  3. Step 3: Cross multiply
    1,229.10x = 1,843.20 × 407.40
  4. Step 4: Simplify right side
    1,229.10x = 750,919.68
  5. Step 5: Solve for x
    x = 750,919.68/1,229.10
  6. Step 6: Final answer
    x = 610.95

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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.