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Finding the Fourth Proportional to 1,236.10, 1,854.39 and 414.47

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Solution

The fourth proportional to 1,236.10, 1,854.39 and 414.47 is: 621.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.10 : 1,854.39 = 414.47 : x
  2. Step 2: Convert to fraction form
    1,236.10/1,854.39 = 414.47/x
  3. Step 3: Cross multiply
    1,236.10x = 1,854.39 × 414.47
  4. Step 4: Simplify right side
    1,236.10x = 768,589.02
  5. Step 5: Solve for x
    x = 768,589.02/1,236.10
  6. Step 6: Final answer
    x = 621.79

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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.