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Finding the Fourth Proportional to 1,392.73, 2,089.19 and 418.90

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Solution

The fourth proportional to 1,392.73, 2,089.19 and 418.90 is: 628.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.73 : 2,089.19 = 418.90 : x
  2. Step 2: Convert to fraction form
    1,392.73/2,089.19 = 418.90/x
  3. Step 3: Cross multiply
    1,392.73x = 2,089.19 × 418.90
  4. Step 4: Simplify right side
    1,392.73x = 875,161.69
  5. Step 5: Solve for x
    x = 875,161.69/1,392.73
  6. Step 6: Final answer
    x = 628.38

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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.