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Finding the Fourth Proportional to 1,393.20, 2,089.19 and 419.38

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Solution

The fourth proportional to 1,393.20, 2,089.19 and 419.38 is: 628.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.20 : 2,089.19 = 419.38 : x
  2. Step 2: Convert to fraction form
    1,393.20/2,089.19 = 419.38/x
  3. Step 3: Cross multiply
    1,393.20x = 2,089.19 × 419.38
  4. Step 4: Simplify right side
    1,393.20x = 876,160.33
  5. Step 5: Solve for x
    x = 876,160.33/1,393.20
  6. Step 6: Final answer
    x = 628.88

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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.