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Finding the Fourth Proportional to 1,393.44, 2,089.86 and 419.64

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Solution

The fourth proportional to 1,393.44, 2,089.86 and 419.64 is: 629.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.44 : 2,089.86 = 419.64 : x
  2. Step 2: Convert to fraction form
    1,393.44/2,089.86 = 419.64/x
  3. Step 3: Cross multiply
    1,393.44x = 2,089.86 × 419.64
  4. Step 4: Simplify right side
    1,393.44x = 876,988.85
  5. Step 5: Solve for x
    x = 876,988.85/1,393.44
  6. Step 6: Final answer
    x = 629.37

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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.